There is a nice blogspot.com page at Louisiana Naturalist that shows how to identify four of the dark swallowtail butterflies.* Following that page, this is a Spicebush Swallowtail (Papilio troilus).
» ID’ed as Papilio troilus or “Spicebush Swallowtail” at: [ BAMONA ] [ BugGuide ]
» Species pages: [ BAMONA ] [ BugGuide ] [ UK Butterflies ]
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* The four “dark swallowtails” are:
» Pipevine Swallowtail (Battus philenor)
» Black Swallowtail (Papilio polyxenes)
» Spicebush Swallowtail (Papilio troilus), and
» dark morph female Eastern Tiger Swallowtail (Papilio glaucus).
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