31 December 2005
15 December 2005
Mark of Michigan Odonotes beat me to a review of A Dazzle of Dragonflies, a fantastic book for any bug lover, whether a sophisticated dragonfly hunter, or someone who just thinks they are neat and interesting. Mark's comments echo my own feelings on the book, so I totally recommend it.
Towards the end of the field season, I also picked up a copy of The Caterpillars of Eastern North America (the Princeton Guide). This is a fantastic and long-overdue field guide. Some may prefer the Field Guide to Caterpillars from the "Through Binoculars" series. I like the Princeton Guide better.
Of course, I recommend all the books over in my sidebar...they are the best dragonfly guides around.
And here are a couple of books that look very tempting, which are on my reading list. First is the Field Guide to Grasshoppers, Crickets, and Katydids of the United States. These are beautiful insects, and I have often wished I knew more about them. I'm going to pick this one up. If there are any Orthoptera experts out there, let me know what you think of this book!
Since I like the Princeton Guide so much, I expect I will also enjoy their Garden Insects of North America.
07 December 2005
While you're over there, don't forget to submit your own post for the next Circus to Nuthatch, who can be pestered at nuthatch.ba AT gmail.com.
02 December 2005
We found this Harlequin Flower Beetle (Gymnetis caseyi) in Texas slurping up some fermented slop that had been slapped out to attract sap-seeking butterflies. Those fine lines on the wing covers (elytra) are scratches, like gouges in the paint job of a Volkswagen.
One guy who is already thinking "beetle" is Mike Quinn of Texas Parks & Wildlife, who set up the Texas Beetle Information page, where you can see much nicer photos of the Harlequin Flower Beetle with references and other info.
30 November 2005
C'mon. Let's go shopping!
Aisle 1. Arachnids.
A noisy spider? That sounds like a good pet. Icecube's Keep brand.
And Sedition.com has a cute spider that looks like it's ready to give you a hug.
Wow! I didn't even know there were such things as sea spiders, a.k.a. pycnogonids. New from Deap-Sea News.
From Nature Writers of Texas, a variety pack of garden-friendly spiders.
Aisle 2. Insects.
Night of the Kingfisher has come up with a green spotted beetle, claims it cleans up decaying beach detritus.
Sedition.com has come out with a flannel shirt decorated with the heads of hornets instead of sequins. Now that's fashion!
Here's something different. Not an ant, not a lion, but an insect called an antlion. We called these doodlebugs when I was a kid! By Firefly Forest Blog.
The House and Other Arctic Musings has a mystery wasp. I'm afraid to have it shipped, since it looks like this one might have ended up in Nunavut, Canada by accident.
Mayflies making glitter of the air. Beautiful imagery by Leaning Birch.
My friends who are birders might be interested in obtaining living formic acid dispensers from Nature Writers of Texas so they can watch some wild birds do a little anting.
Aisle 2, Lepidoptera section.
This Butterfly Flutter Ripple Effect experiment by Creative Science Quarterly sounds like more fun than a chemistry set.
The batteries aren't included, but this owlet moth by Science and Sarcasm comes complete with its own nucleic acid sequence!
Jenn from Invasive Species Weblog has a nice pair of fall cankerworm moths -- the male is cute but the little wingless females look almost cuddly. Almost.
Firefly Forest Blog's Queen butterfly is a great gift for the little princess on my shopping list.
Snail's Tales has a delicate but resiliant Common Wood Nymph. Looks like the only one left is a little worse for wear, though!
Milkriver has two versions of Asterocampa butterflies, and points out how to choose between an emperor and an empress!
Aisle 3. Gastropods.
Here's the perfect gift to put inside a series of nested boxes: one of the tiniest snails I've ever (not) seen! By luigi9555.
Another tiny snail, this one from far away Turkey! Via Snail's Tales.
Research at a Snail's Pace, another specialized purveyor of invertebrate goodies, offers a snail that's been around since the Pleistocene.
Aisle 3, Adult section.
How about these two romantic banana slugs via Far Cartouche, or this kissing pair at Middle-Fork.
The related leopard slugs (with startling blue sex organ) brought to us by bootstrap analysis are even more explicit. I think if you crossed one of the banana slugs with a leopard slug, you'd get one of these attractive spotted banana slug models by thornogson.
Aisle 4. The jumble bin.
I'm bummed there isn't a picture on the box, but carnivorous sponges sound too good to pass up (from Deep-Sea News).
Words and Pictures has a wonderful collection of the latter, a photo salon including some lepidoptera, odonata (brilliant!), a snail, some lovely diptera, and for my frat-boy brother, a pair of X-rated rose chafers.
Milkriver brings us a grab-bag of unidentified invertebrates -- although the species are not known, moths, spiders, and flies are recognizable...but do you know what a solfugid is?
Well, my bag is full for now. Now, how do I wrap these things.....?
29 November 2005
Of course, the weather is always better there than here, and this weekend was no exception. We left Michigan in a howling snowstorm with the temps about 15 degree F. The Valley was sunny and hot, hotter than any of our previous November visits. That meant ponds, ditches, and the Rio Grande were buzzing with odonata!
We looked for odonata at several locations, primarily Santa Ana National Wildlife Refuge (SANWR), Bentsen-Rio Grande Valley State Park/World Birding Center, Edinburg Scenic Wetlands, and along the Rio Grande at Salineno. We ended up with over two dozen species, which is quite respectable for this time of year:
American Rubyspot (Hetaerina americana)
Common Spreadwing (Lestes disjunctus)
We are still examining some photos of another female Lestes
Blue-fronted Dancer (Argia apicaulis)
Blue-ringed Dancer (A. sedula) – According to both Abbott's great book, Dragonflies and Damselflies of Texas and the South-Central States, and his web site, Odonata Central, a late date for the region. We had at least a half dozen along the irrigation canal at Bentsen.
Dusky Dancer (A. translata)
Double-striped Bluet (Enallagma basidens) -- One male along the irrigation canal at Bentsen; late date.
Familiar Bluet (E. civile)
Neotropical Bluet (E. novaehipaniae) -- A lifer for us. I picked it out of a spider web at Salineno so I was able to confirm the ID later.
Rambur’s Forktail (Ischnura ramburii) – We photographed one interesting blue-thoraxed male along the irrigation canal at Bentsen.
Caribbean Yellowface (Neoerythromma cultellatum) - A lifer, a pair in tandem along the irrigation canal at Bentsen; late date. These were super-cool. Wish we could have gotten a photo (without falling in the canal).
Desert Firetail (Telebasis salva)
Common Green Darner (Anax junius)
Black Setwing (Dythemis nigrescens) -- Quite common, handsome little guys like the one pictured above.
Pin-tailed Pondhawk (Erythemis plebeja) – One male at the ponds near the front entrance of SANWR; late date by over a month.
Eastern Pondhawk (Erythemis simplicollis)
Spot-tailed Dasher (Micrathyria aequalis) –Also quite late.
Thornbush Dasher (Micrathyria hageni)
Roseate Skimmer (Orthemis ferruginea)
Blue Dasher (Pachydiplax longipennis)
Wandering Glider (Pantala flavescens)
Eastern Amberwing (Perithemis tenera) – One female along irrigation canal at Bentsen was also a little late.
Filigree Skimmer (Pseudoleon superbus) – This stunning ode was not a lifer, as we had seen one at SANWR two years ago. Theoretically, there really isn't great breeding habitat (noted as desert ponds and slow streams) in the vicinity for them, and they are thought to be vagrants. This time, we saw four individuals at SANWR, none of which were near water. The female below was also at the old manager's residence, where we had nine different odonata species! Abbott lists no dates past late August.
Variegated Meadowhawk (Sympetrum corruptum)
Black Saddlebags (Tramea lacerata)
Red Saddlebags (T. onusta)
Many of these late dates mostly reflect the lack of work in the Valley at this time of year. With the addition of Josh Rose on the staff of the World Birding Center, this should change. Josh is great with birds, getting a crash course in rare Texas butterflies, has a keen interest in beetles and other insects, and is a very enthusiastic odonatist, having worked on them for his PhD. He is leading regular dragonfly walks at Bentsen, and is sure to find many more interesting odes in the months to come. He's not only knowledgeable, but friendly and generous with his time. Thanks for your help, Josh!
13 November 2005
Then there were these door knockers. The one of the left was nice, I didn't care for the shiny one on the right. The little dragonfly on the bottom is also a doorbell.
I like our current door knocker, which I got on eBay. Yeah, I know our door needs painting.
12 November 2005
Make sure to visit Snail's Tales for the second edition of Circus of the Spineless. The next edition, slated for November 30, will be right here at Urban Dragon Hunters. Click the image above for guidance on submissions, which can be emailed to nannonthemis AT gmail.com.
05 November 2005
It was another unseasonably warm fall day here in Michigan, with temperatures around 70F. As usual, the last species of dragonfly on the wing was the Autumn (Yellow-legged) Meadowhawk (Sympetrum vicinum). They are not uncommon in early November, if the weather stays warm; the late date for a specimen in southeast Michigan is November 9. Nonetheless, I was a little surprised to see this hopeful pair flying around in tandem today. They seemed...tired.
S. vicinum is one of the several lookalike Sympetrum. But the females are very easy to identify, with just a glance. They have spout-shaped ovipositors, seen here on this female in profile.
The temperatures are not going to get drastically cold the next week, but it will turn rainy and windy. These are probably the last dragonflies I'll see this season, at least here in Michigan. I'll be going to the Rio Grande Valley of Texas over Thanksgiving. This has become something of a tradition for the Urban Dragon Hunters. Odonata are not plentiful there this time of year, but the butterflies can be good and you never know what interesting bird might show up.
Farewell, little red odes of summer. See you next year.
04 November 2005
The Karner Blue (Lycaeides melissa samuelis) is an endangered butterfly endemic to the Great Lakes region, with the largest populations in Michigan and Wisconsin. While other subspecies in the L. melissa complex feed on a variety of plants in the Fabaceae family, the wild lupine, Lupinus perennis, is the only host plant for the Karner Blue, contributing to its rarity.
A new paper in the Journal of the Lepidopterists' Society notes a new larval host plant for the nominate subspecies of Melissa Blue, L. melissa melissa. Colonies in western Wisconsin and eastern Minnesota are feeding on crown vetch, Coronilla varia, an aggressive introduced legume planted for erosion control and slope stabilizations, especially along highways. It is now considered a serious invasive species.
The reason this is so notable is that the rapid spread of crown vetch, in particular along road corridors, provides a means for the Melissa Blue to penetrate into the range of the Karner Blue; in fact, the Melissa Blue is undergoing a range expansion that is facilitated by its new use of crown vetch. The two species are now separated by less than 70 km (~43 miles), including the areas that contain the main part of the Wisconsin population of Karner Blue.
Nobody is certain what will happen when the two species meet, but there is a good chance that they will hybridize and produce viable offspring. This possibility is a huge threat to the existence of Karner Blue as a distinct subspecies.
Dana, R. P., C. Lane, and D. Hansen. 2005. New larval hostplant for Lycaeides melissa melissa in Wisconsin and Minnesota and potential threat to Lycaeides melissa samuelis (Lycaenidae). Journal of the Lepidopterists' Society 59:175-177. Photo public domain, USFWS.
11 October 2005
Things are a tad busy for me right now, but I am working on a post on dragonfly migration, by request, as well as a summary of the 2005 ode season. Meanwhile, I will leave you with the little ode that thinks she's a wasp: a female Eastern Amberwing (Perithemis tenera). She is, indeed, a diminutive jewel in the late summer sun.
30 September 2005
It's here: The Circus of the Spineless, the blog carnival devoted to invertebrates. It debuts at Milkriver Blog, and Tony did an great job with a truly impressive number of entries. With three rings and 54 performers, this has to be one of the biggest carnival roll-outs in the history of the blogosphere. Go check out what's under the Big Top!!
29 September 2005
Remember back in July, when I said one of our goals was to find Great Spreadwing, Archilestes grandis, in Michigan? On 27 September, we did.
We've been looking for this brawny bug for a couple of years; it's a southwestern species that has been expanding its range since the 1920s. It was first found in southwest Ontario in 2002, although it has been present in Ohio since 1925. The other day, Stylurus and I met in northwestern Wayne Co. for dinner. It was a fairly new restaurant, part of a ~35 ac (~15 ha), as-yet unfinished development. A small creek emerged from a metal culvert under the busy road out front and went right between the restaurant and the parking lot, heading off to the rear of the development. The creek is perhaps 1 meter across, and the "protected natural wet land" (according to the sign; sic, and sick) is about 4 meters wide, full of weeds, trash, etc.
It was a beautiful day, the last really warm day of summer. We crossed over the decorative little bridge, and a flash of substantial odonata wings caught our attention. I literally skidded to a stop, thinking it might be a late ovipositing Aeshna working the creek. But no, perched on a poorly planted (and therefore mostly dead) shrub was an enormous female spreadwing.
"Wow," I said...I think out loud, "that has to be Archilestes grandis!"
"There's another!" Stylurus pointed out a male.
This was a little too unlikely, I thought. "They must be Amber-wings," I said, referring to the next-largest spreadwing, Lestes eurinus, still staring dreamily at the perched female. I knew as I said it this was not true.
Of course, we both had nets in the car, and I went ahead and caught the female. No doubt, here it was: Michigan's first Great Spreadwing.
Dinner abandoned for the time being, we walked along the creek for about a quarter-mile. The swath of green was never more than 5 meters or so wide, bordered by erosion cloth and then denuded ground with a covering of opportunistic weeds. The creek itself was rarely visible. Along most of the length were piles of twisted brush, thick growths of thistles, burdocks, buckthorn, and pioneering patches of Purple Loosestrife: an excellent example of Michigan's fantastic wetland protection and mitigation laws in action. There were five or so places where bridges leading to nowhere (but soon, office buildings) had been built over the creek, offering glimpses on either side of various types of garbage, and about five or six other Great Spreadwings. We caught a male for a second voucher. The sun was waning and we went back to the restaurant for a celebratory meal.
Yesterday afternoon it was still fairly warm but a strong cold front was approaching. I returned to try to census the population along the creek and take some photos. By the time I arrived it was cloudy with a strong wind. Hunkering low in the vegetation I located two pairs of Archilestes in tandem, and another six solo males. I would say that there are probably at least two or three dozen individuals along the creek, and that this is likely an established population. How long it will persist as the area becomes more degraded is anybody's guess. This species is tolerant of disturbed areas, but if the creek gets completely overgrown, polluted from runoff from the parking lots, full of algae from fertilizer or other nutrients such as abundant goose poop from the retention basin feeding it, or the flow gets obstructed from all the trash, then it may not longer be suitable habitat for this very grand Great Spreadwing.
22 September 2005
19 September 2005
11 September 2005
I've seen pondhawks eating other dragonflies and big gomphids taking down large butterflies, but I usually see bluets eating gnats. I was surprised to see this Familiar Bluet (Enallagma civile) hauling around a moth which probably weighed nearly as much as the damsel itself. I didn't see the initial capture, but the moth was alive when I first started taking pictures. At this point, the bluet had already dined on the moth's head.
Thistle or plant down that had gotten stuck on the bluet's thoracic hairs is silhouetted in the late afternoon sun.
08 September 2005
At a large, scrubby open area near the Detroit River on Labor Day, Stylurus and I saw hundreds of Black Saddlebags. They were both in the air hunting, and many were perched in the vegetation, like this one. There were a couple of Carolina Saddlebags with them (we were hoping for the rarer Red Saddlebags, T. onusta, but the one we caught was T. carolina), and many Pantalas. Normally, Wandering Glider (P. flavescens) is the more common species, but in this group Spot-winged Glider (P. hymenaea) outnumbered them; it's been a bumper year here for that species.
Update on dragonfly migration: A nifty paper was published in 2006. The abstract is here and a summary appears at Science Daily.
It's also been a decent year here for southern butterflies. Nectaring on Eupatorium (mostly tall boneset) were at least a half-dozen Fiery Skippers (Hylephila phyleus). This is a species just at or beyond the northern limit of its range in Michigan. Some years it's fairly common, while it is absent in others.
It must be autumn.
01 September 2005
I can't say that I can tell you much about the tropical genus Uracis, except that they are a lot like dragonlets (Erythrodiplax) and also libellulids. The male above is Uracis fastigiata. In central Panama, we found them in sun-dappled shady areas near water, but they weren't common. The extent of the black on the wings of this species varies; this is as extensive as it gets. The wings actually appeared stiff and plastic-like, and they flew with a fluttery, butterfly-like flight. It must be the end of their flight season, because most we saw were worn, if not battered.
In sunny, open areas we found the related Uracis imbuta (below). They were a little smaller, and more typically dragonlet-like, without the thick-winged appearance. Do you see what that individual is perched on? That's right -- Uracis grass.
31 August 2005
28 August 2005
We returned to a couple of the spots I'd discovered on my bike earlier this summer. They were much drier, allowing further exploration. We were able to get right next to a mucky shallow pond in the woods, adjacent to the Huron, and were rewarded with the sight of at least three male Great Blue Skimmers, a species we'd only just confirmed for the state in July. We took one voucher for this new site, and I didn't even fall in the stinky mud.
Meanwhile, I've been working through the identifications of odonata I photographed on my recent tropical trip, a task that could not be accomplished without the expert opinions of Dennis Paulson, Nick Donnelly, and Sid Dunkle. One of the cooler damselflies I saw was an Acanthagrion, or wedgetail. The Mexican Wedgetail (Acanthagrion quadratum) occurs in the southwestern U.S., but I've never seen one. This photo is likely A. trilobatum. You can see how they got their name. I'll post a list of positively ID'd species soon, as well as more photos. I'll be providing my photos to Paulson's Odonata Biodiversity web pages, which were a great resource for me.
20 August 2005
Another common name for this group is helicopter damselflies. Pseudostigmatids have very large spots at their wing tips, sometimes replacing the pterostigmas. When they fly -- quite slowly -- they really resemble helicopters! They also have a very specialized mode of foraging: they hover in front of spiderwebs and pluck out the spiders, preferring soft-bodied arachnids to hard-bodied ones. Although they look ungainly, they are skillful at manuevering close to the web to grab the spider, and then going in reverse to back away without getting entanged in the web.
This female (left) is in the genus Pseudostigma; according to a checklist by T.W. Donnelly it should be P. accedens. The other species is P. aberrans, a good match for this photo. A key to the Costa Rican species notes that accedens is rarely found in Panama, so it's a toss-up. This photo was taken at the Metropolitan Nature Park in Panama City. UPDATE: Both Donnelly and Dennis Paulson have identified this as most likely Mecistogaster ornata.
Pseudostigmatidae breed in standing water in tree holes. Males will defend good breeding sites. Little sunny openings at stream crossings are also good places for spiders. Consequently, we were able to find Megaloprepus caerulatus in many such locations. Although the largest odonate in the world, individuals vary greatly in size. Some seemed truly huge, others, just big.
The one on the right allowed us to take many photos as he explored leaf tips looking for spiders. The second photo, below, isn't great, but shows that the black spot on the wings is actually metallic blue. When they land, helicopter damsels fold their wings slowly, it looks really cool! This individual was photographed outside of Gamboa, Panama, along the Rio Chico Masambi.
A web site on the odonata of La Selva, in Costa Rica, has photos of specimens of four species of helicopter damselflies. Seeing these magnificent damselflies was one of the highlights of my trip. They are still at the top of my "must see" list!
29 July 2005
We also went over some literature records. Several are from prior to 1880 (Hagen's Bluet, Enallagma hageni; Canada Darner, Aeshna canadensis; Mottled Darner, A. clepsydra; and Williamson's Emerald, Somatochlora williamsoni), and others might be in error. Of the 90 species on the checklist, there are only 13 I haven't seen, and half of them are species that either haven't been seen for over 100 years or that I suspect are in error. Eventually, Mark and I became sidetracked into reading some of the correspondence given to the museum by E. B. Williamson (the MOS newsletter's namesake) from colleague Clarence Kennedy. I always find it interesting to get to know historical figures from a personal perspective rather than just seeing their published papers and the results of their field work. Let's just say that these two men were particularly intriguing; Mark promises to liven up our winter months summarizing some of these riveting letters in his blog.
Today I was hoping to find either Elegant Spreadwing or Common/Southern Spreadwing (Lestes disjunctus disjunctus and L. d. australis). There actually aren't that many L. d. disjunctus specimens from southern Michigan; I don't find them all that common. There are just a smattering of L. d. australis specimens from the state.
Now that I have a bike rack, I'm able to explore further afield at the metroparks. There is a 3-mile stretch between Lower Huron and Willow metroparks that, from an aerial view, looked to have a nice old wooded oxbow near the bike path, so that's where I headed. This was nearly all dried up, just squishy much and lots of wetland vegetation. It was loaded with Lestes, mostly Sweetflag Spreadwing, L. forcipatus. Wherever I find these, I find A LOT of them. The males look pretty much like Common Spreadwings. The easiest thing to do is catch a pair and take a look at the female. If her ovipositor is longer than her superior anal appendages, like this, then it's a pair of Sweetflags. I netted every nth pair that I couldn't get a good look at through binoculars, but could not come up with Common/Southern. There were a smattering of Slender Spreadwings, L. rectangularis, some Ruby Meadowhawks, Sympetrum rubicundulum, and the many of the ubiquitous Blue-fronted Dancers, Argia apicalis. Despite the lack of diversity, this looks like a great spot earlier in the season, and later on for patrolling Aeshnas. I'm headed to a different spot furthern downriver tomorrow.
20 July 2005
Skimming Bluets (Enallagma geminatum) are very dainty, and usually seen dancing over glassy-surfaced ponds. This one paused nearby for me to admire.
14 July 2005
The Blue-ringed Dancer (Argia sedula) is the least common of the blue dancers in our area. Although I noted them along the Rouge River some years ago, I did not encounter them again until yesterday, when I obtained the necessary first voucher specimen to put them officially on the Wayne County list. I think they are the most beautiful of Michigan's Argias; this photo hardly does them justice.
10 July 2005
Great Blue Skimmer (Libellula vibrans) was first recorded in Michigan in 1995, described in a paper published (in Japanese) in the journal Aeschna by Tokihiro Nishida. He had one on 22 June 1995, and photographed a male 10 July 1995, at a small wooded wetland in Westland, Wayne Co. If he obtained a specimen, it is not in the University of Michigan odonata collection.
I think I've looked at this paper, with its tantalizing color photos of species in the county that I have yet to find, dozens of times. In 2004, I went to what I figured HAD to be the swamp Nishida described in Westland, an extremely built-up community. It could only be at Holliday Nature Preserve, a county park. Although I returned again and again, finding other species he noted there, there was no sign of L. vibrans. The swamp also appeared to be filling in with button bush and fallen trees, as seen below.
Accessible wooded ponds are hard to come by in this county. One other looked promising, but repeated visits in 2005 did not turn up this species. Perhaps Nishida's Great Blue Skimmers were just wanderers, and would not be found again without luck, and a year when conditions, perhaps drought in the southeast, brought L. vibrans north to Michigan.
I thought perhaps this might be the lucky year. The Northeast Odes listserv noted an influx of Great Blue Skimmers in New York state. Mark O'Brien reported sightings in Washtenaw Co. just last week. In fact, he told me he was going to go try to voucher one for the first official state record on Saturday. Alas, I was committed to do a survey at Humbug.
We finished our survey of Humbug yesterday (which did not turn up Comet Darner, Painted Skimmer, or any other interesting odonate) sooner than expected, so Stylurus and I decided to head up to Holliday NP. Within five minutes of arrival, I called excitedly over our two-way radios "It's here! I have a male over here!" Just like the books said, this Great Blue Skimmer kept returning to his perch in the dappled sunlight after looping out over the swamp. The very mucky, duckweed-covered-water-0f-indeterminate-depth swamp. Right in front of me. So close and so obstructed by branches I could not possibly get a good swing. I had promised myself if I finally found this thing I'd go in the water after it. Momentarily, I was standing in some very fragrant, warm-as-piss gunk. Stylurus arrived in time to see our bug quite well, before it flew out over the button bushes. We hunted as best we could to no avail.
This brought about a change in today's plans. After doing some other surveying, we arrived at Holliday at about 1:30 PM, wearing rubber boots in 90 degree weather. We went in separate directions, and searched unsuccessfully for half an hour. I sat on a moss and raccoon-crap covered stump, wondering how many dozen Blue Dashers I could stand watching in this reeking place. Suddenly, the radio beeped...Stylurus had two males staked out at the opposite side of the swamp!
One cannot race through this area. The water was opaque and filled with downed trees. I made it half way around and onto "land" before I stepped into a hole and collapsed in the putrid mud. I can't cut to the chase -- that was it -- but suffice to say we had a number of males in a much shallower (albeit no less stinky) spot. We were able to obtain some mediocre photos and a voucher for Michigan's first state record -- 10 years to the day that Nishida had one in the exact same place. Domo arigato, Nishida-san.
Nishida, T. 1999. The odonata collected in the United States of America, mainly in the State of Michigan. Aeshna 36:1-20.
Craves, J. A. 2006. First Michigan specimens of Libellula vibrans Fabricius (Odonata: Libellulidae). Great Lakes Entomologist 39: 91-93.
07 July 2005
I spent quite awhile in the field today, but found nothing truly notable. I did see my first Swamp Spreadwings (Lestes vigilax) of the year. I'm not sure why, but I love spreadwings. One of our goals is to find Michigan's first Great Spreadwing (Archilestes grandis). Maybe this will be the year.
06 July 2005
04 July 2005
A Macromia was patrolling one, and we staked ourselves at strategic points in the stream. This is where my brilliant new water shoes came in handy. Unfortunately, the river cruiser only made a few passes and eluded us. We think it was either an Illinois (M. illinoiensis) or Allegheny (M. alleghaniensis).
We ended up with only about two dozen species, including this lovely fresh Halloween Pennant (Celithemis eponina). There were very few damselflies -- no spreadwings and only two species of bluets. And the entire weekend we did not see a single green darner. How weird is that?
03 July 2005
Teneral female Flag-tailed Spinyleg (you can see the spines on her thighs). I like the commuter strap-hanger look.
Near Foster, we went to a boat launch where we could walk along the Ohio, dodging every type of garbage known to man from holiday party boats. Please, people. There were a number of medium-sized gomphids with paddle-like clubs. On the plus side, they tended to perch facing away from us, so we could sneak up fairly close. On the minus side, a good photo was hard to take, and it took us forever to catch one because we had to creep over ankle-twisting rocks. They turned out to be Cobra Clubtails (Gomphus vastus).
Uncooperative Cobra Clubtail.
As we were leaving there, a very teneral clubtail, on its maiden flight, caught the light. Without a whole lot of reference materials, we are uncertain what it is. A cursory look at the wing veins led me to think Ophiogomphus (snaketail), but habitat and lack of extensive green on the thorax seems to vote against that. Stylurus thinks it's a Stylurus, and I am leaning to Stylurus notatus, the Elusive Clubtail. The habitat, size, markings (such as they are) look right. If so, it will be the second one we've stumbled across, when many people can never find one; our first was near the Mississippi in Wisconsin.
26 June 2005
Alas, we didn't find Jack Schitt there. It was fairly dry, since it's been so hot, and maybe the density of the vegetation, with no open spots, makes it less ideal than we had hoped. We wandered around -- still lots of interesting land and birds -- and ended up at two retention ponds behind a new megachurch of enigmatic denomination. The ponds looked a year old. There was a lot of activity by the usual species: pondhawks and dashers, whitetails and Widow Skimmers, etc. There were several Carolina Saddlebags (Tramea carolina) in the mix, a species we only located in the county last year. Stylurus set about trying to nab one, while I scanned the grass for damsels.
I have been on the lookout five years for any of the suite of similar bluets that have not been found in the county at all or for many years: Boreal (Enallagma boreale), Northern (E. cyathigerum), Hagen's (E. hageni), or Marsh (E. ebrium). I have looked at Familiar Bluets until I'm, uh, blue in the face. Today was no exception. Familiar, familiar, familiar. All those cerci with the funny little pale tubercule. Finally my persistance paid off, and I found one with forked superior cerci (left). Marsh Bluet! I went on to find that about a third of the bluets at the pond were Marsh, the rest Familiar. After awhile, I could see the Marsh were a little smaller and paler blue, but the patterns were pretty much alike. The only previous specimen of Marsh Bluet in the county is from 1904.
As we were getting ready to leave, what should appear over one of the ponds. You guessed it: Comet Darner. It flew only briefly, then perched about 17 feet up in a tree in the shade. It was too distant and the lighting too poor for a decent photo, but it offered us long looks through binoculars. Stylurus put both our sets of net poles together and still couldn't reach it. It flew off deeper into the trees, and although we sat there in the 94F heat for another 45 minutes, it never reappeared.
Today we went to Lenawee Co., back to Indian Trails Crossing Park. It is pleasant to walk along, or in, the River Raisin looking for gomphids and Macromia. It is mostly shallow, sandy or gravelly, and clean (or at least it seems pretty clean. I'll let you know if any of the scratches, scrapes, or fly bites on my legs become hideously infected.). Although we saw a couple Macromia, and some Black-shouldered Spinylegs, it was unproductive overall. But scenic.
24 June 2005
18 June 2005
Mark O'Brien's L. quadrimaculata praenubila
There are only four specimen records of L. semifasciata for Michigan; the dates are 1892, two from 1908, and one "recent" record from 1936. Sight records have been noted (Kielb 1996), but without verification. In 2001, O'Brien (2002) photographed what he thought was L. semifasciata, albeit a slightly strange one (above), and later found out that it was actually a rare form of the Four-spotted Skimmer, Libellula quadrimacula (O'Brien 2003). L. quadrimaculata is a very widespread species, known in the Europe as the Four-spotted Chaser, and is more common in Michigan (although there has not been a Wayne Co. record since 1917). The form Mark saw was L. q. praenubila, a form with more highly colored wingtips that is found in Europe, with only one reference to a North American sighting, from Maine (Harvey 1901). A typical female L. quadrimaculata can be seen here, and compared to the praenubila form here.
I've examined my female specimen and verified that it is indeed L. semifasciata and not L. q. praenubila. Among the diagnotic features are a yellow stigma bordered in black, rather than all brown in L. quadrimaculata; fewer bridge crossveins on the forewing than in L. quadrimaculata; and, in females, a widened flange on abdominal segment 8, not present in L. quadrimaculata. Photos of these features in the June 16 specimen are below, taken through a dissecting microscope and adjusted for the resulting lousy exposure.
L. semifasciata: pterostigma yellow bordered in black.
L. semifasciata: s8 is slightly widened
L. semifasciata: enhanced photo showing details of forewing veination. Click for larger image.
Photos of L. semifasciata -- the whole bug, alive in living color -- can be seen here, here, and here. The last image is a biggy, but shows the pterostigma and wing veination especially well.
The Painted Skimmer is considered rare in Ontario, with only three sighting records in Essex Co. in the Ontario Odonata Atlas. Thus, this Wayne Co. record is a smashingly good find.
And, as an addendum, today we found ANOTHER Painted Skimmer about ten miles northwest from Humbug, at a great site where we have found many other interesting odes -- a marsh and wooded wetland complex slated for development. It quickly flew over a fence, so we were unable to photograph it or examine it. Perhaps this species is more common than previously believed; we'll certainly be looking for it in earnest in the coming weeks to clarify the situation.
- Harvey, F.L. 1901. Contributions to the Odonata of Maine -- IV. Ento. News 12:269-277.
- Kielb, M.A. 1996. The occurrence of Libellulid dragonflies in southeastern Michigan and adjacent Ontario. Great Lakes Entom. 29:1-9.
- O'Brien, M. F. 2002. The Painted Skimmer, Libellula semifasciata, in Michigan: rare or not? Mich. Birds & Nat. Hist. 9:17-18.
- O'Brien, M.F. 2003. A rare form of Libellula quadrimaculata -- "praenubila" in Michigan. Williamsonia 7(2):1-2.