Today, Nannothemis and I did another dragonfly survey at Humbug Marsh of the Detroit River International Wildlife Refuge near Trenton, Michigan.
The Common Green Darner (Anax junius) swarm was spectacular with 100's in the air at any point in time. There were also a couple other species flying with them such as Wandering Glider (Pantela flavascens) and Black Saddlebags (Tramea lacerata).
We found a few Shadow Darners (Aeshna umbrosa), doing what they do in the shadows.
However, the highlight of the afternoon was the number of Russet-tipped Clubtails (Stylurus plagiatus). During a one-hour survey in the vicinity of the Detroit River, 91 individuals were found perched on the various woody plants, mountain mint, and this Cottonwood.
This is the largest population of this species that we've found and Nannothemis has posted a request for any information of other populations in the latest Williamsonia (newsletter of the Michigan Odonata Survey).