Gray Hairstreak
Strymon melinus

f20 @ 1/500s, ISO:1250, Nikon D3S w 105mm macro

"Gray Hairstreak," Wikipedia, the free encyclopedia. The gray hairstreak is one of the most common hairstreaks in North America, ranging over nearly the entire continent. It occurs also throughout Central America and in northern South America.
Francis A. Crane Wildlife Management Area, East Falmouth, Massachusetts