muscoid fly (order Diptera), suborder Cyclorrhapha, division/section Schizophora ("Muscoid" Flies), subsection Calyptratae, superfamily Muscoidea, something similar to a House Fly (Musca domestica), but the wing venation doesn't quite match that genus in family Muscidae; possibly genus Fannia now moved to its own family, Fannidae; or possibly family Anthomyiidae; photos = fly+Poison-ivy_MAC_©DaveSpier_D046442iN2 + 41-2 + 42-1 + 41-1
[You can find links on BugGuide using this starter: http://bugguide.net/node/view/179344]