black morph Eastern Tiger Swallowtail from yesterday, this one turned out to be the 'Spice Bush Swallowtail' aka 'Green-Clouded Swallowtail' (Papilio troilus). The signature identification is the blue-green 'comet' that replaces the second from the bottom orange spot in the inner row of orange spots on the bottom of the wings.
Pipevine Swallowtail. Apparently Pipevine Swallowtails taste really bad, and are toxic from the Pipevine they eat as caterpillars, and birds are widely conditioned to avoid them. They must provoke a strong reaction, as the actual numbers of Pipevine butterflies, at least around here, seems pretty small (I have yet to find one).
Zabulon Skipper (Poanes zabulon). I had no luck getting a dorsal picture, but that's supposed to be pretty plain in any event. It turns out it was one of the few skippers I succeeded in identifying last year, although I probably didn't post it.