You have to get pretty close to see the white face on one of NYC’s most common dragonflies, the Blue Dasher (Pachydiplax longipennis). This is a male; as he gets older, his blue abdomen will get more powdery or chalkier looking. Such pruinescence, as it’s called, is caused by wax exuded from the animals’ cuticle. It’s seen on (mostly) males of many species of odonates, including spectacularly the Common Whitetail:Plathemis lydia.
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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.