I was happy to spot these male Powdered Dancer damselflies (Argia moesta) on Monday at a creek in Prince William County, Virginia. Most of the damselflies that I see regularly are found at small ponds and marshy areas, but this species prefers rocky streams and rivers. Sometimes Powdered Dancers will perch in the streamside vegetation, but often they will perch flat on rocks in the water, as you can see in several of these shots.
The thoraxes of Male Powdered Dancers are mostly white due to pruinosity, i.e. they are covered by minute waxy dust particles that makes them look frosted or powdered. This phenomenon is present in some dragonflies too, most notably the male Common Whitetail dragonflies.
© Michael Q. Powell. All rights reserved.
Mike Powell 
Beautiful composition, Mike!
Hi Mike, I find it hard to identify bluish damselflies. I use iNaturalist and other websites but I always end up thinking I’ve photographed an Azure Bluet. 🙂
Damselflies confound me a lot. I am part of several odonata groups in Facebook and I will often ask for assistance with identification. I am fortunate too to have a copy of the excellent guide “Damselflies of the Northeast” by Ed Lam that has detailed info and identification tips on most of the damselflies that I am likely to see.