Eastern Swallowtail (Papilio glaucus, female - dark morph) on Buddleja davidii (Butterfly bush)
Hocking Hills State Park, Hocking County, Ohio

This is apparently the same species as the Eastern Tiger Swallowtails, albeit with an alternate coloration. There is an Eastern Black Swallowtail species in the area, however, the markings differ slightly on the upper-wing.

Likely taken in 2012-ish with a Fuji W3 camera.