I'm not an expert in these guys, but since there's no yellow on the top of the wing, I think Pipevine sallowtail is a better match.
Ok, I was going to agree it was a female Black Swallowtail based on Kaufman, but now that I've checkout the excellent comparison info on BugGuide, I think this is actually a dark morph Eastern Tiger: very blue hind wings, no sign of yellow median spots on the hindwing. Too much spotting for a Pipevine, I think.
Also the lack of markings near the head and the general pattern make me agree with Kueda...beautiful bug...great shot.
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