Yesterday I went exploring in Accotink Bay Wildlife Refuge, a nature preserve on the grounds of Fort Belvoir, a nearby US Army installation. I did not see many dragonflies, but was happy to spot some Eastern Forktail (Ischnura verticalis) damselflies. These damselflies are quite small—about an inch (25 mm) in length—and have distinctive blue markings near the tips of their abdomens.
Many damselflies have combinations of black and blue on their bodies, so identification can often be difficult. Usually I start by looking at the body and deciding if it is primarily black, as was the case here, primarily blue, or somewhere in the middle. After that, I examine the shape of the markings at the tip of the abdomens and compare them with the pictures in my damselfly identification guide.
Somehow, though, I always have more problems with damselfly identification that I do with dragonfly identification. Fortunately I am part of several Facebook groups that have experts who can weigh in when I need help in identifying a particular damselfly.
© Michael Q. Powell. All rights reserved.
Mike Powell 
Beautiful metallic sheen on that damselfly. Great shots.
Superb photographs, Mike!
I have the same issues with damsel i.d. and thank goodness for helpful folks on the internet!