When I first tried to identify these damsels years ago I searched on every version of the word green that I could think of because they are such a lovely shade of emerald green. I just knew they had to be named the emerald damsel or the damsel of Oz. Alas, their name comes from their black wings.
They are now active in Indiana and can be found flitting around any sunny spot in the forest. They always seem to be observing me observing them. They fly but not too far. Like all damsels they start out in a swamp or wetland, and metamorphosis into the flying adults that eat, among other insects, lots of mosquitoes.