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Papilio troilus
Side angle of the beautifully brilliant spicebush swallowtail which was sunbathing in my driveway.
The markings on the underside of the wing is slightly different than a black swallowtail. Here are images so you can compare:
Black Swallowtail: http://bugguide.net/node/view/1021210/bg...
http://bugguide.net/node/view/1009150/bg...
Spicebush Swallowtail: http://bugguide.net/node/view/998901/bgi...
http://bugguide.net/node/view/717848/bgi...