The Blue Dashers (Pachydiplax longipennis) have been everywhere this year. I said this two weeks ago, and I repeat it now. It is a banner year for them. Just walking down the streets here in Brooklyn reveals them perched on bare branches of trees, fence posts, and car antennas.
This is a classic pose for the Dashers, with the wings drooped forward. Note the difference in amber patching on the wings between this specimen and the ones above and below. These first three are all males, by the way; females are much harder to find. The species has a seasonal variability in size, with autumn specimens smaller than spring ones. 
And here is one of the females:
Backyard and Beyond 
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