Wild Indigo Duskywing
Erynnis baptisiae

f22 @ 1/320s, ISO:2000, Nikon D3S w 105mm macro

"Erynnis baptisiae," Wikipedia, the free encyclopedia. Erynnis baptisiae, the wild indigo duskywing, is a butterfly of the family Hesperiidae. It is found in North America from southern New England and southern Ontario west to central Nebraska, south to Georgia, the Gulf Coast, and south-central Texas. The species is rapidly expanding its range and abundance by colonizing plantings of crown vetch along roadways and railroad beds.
Frances A. Crane Wildlife Management Area, East Falmouth, Massachusetts