This species has been observed and photographed several times over the recent years, but I don't know if they are more common now than in decades past. Why wouldn't have any of the entomologists have collected a voucher in the past decades, if they were present? (Of course, in my experience this is one of the more difficult clubtails to capture with a net)
Delhi Metropark appears to have a good population and easy access to both river and upland habitat. Since this clubtail flies primarily in June, the weather in Michigan can be quite uncooperative.
|The Huron River at Delhi Metropark|
|female Cobra Clubtail (G. vastus)|
|female Cobra Clubtail (G. vastus) subgenital plates|
|The Huron River at Dexter-Huron Metropark|
It was nice to find another location with the clubtails, but an interesting sight was this water snake with its meal (I assume it's a bullhead):
Northern Water Snake (Nerodia sipedon)
|female Rusty Snaketail (O. rupinsulensis)|
|female Comet Darner (Anax longipes)|
|male Swift River Cruiser (Macromia illinoiensis)|
...and the target species of the day:
|male Cobra Clubtail (G. vastus)|
|abdomen of male Cobra Clubtail (G. vastus)|
It's difficult to know why this clubtail species wasn't vouchered in the past decades for Washtenaw County, given that other species utilizing the same river habitats were present. At least we know the water quality and river structure allows this species' population to exist at this time.