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Papilio glaucus
Eastern Tiger Swallowtail (female, dark form) butterfly spotted near Medicine Bluff Creek, OK.
Nice find! Some slight differences to look for to help distinguish the Eastern Tiger from the Black Swallowtails...Black swallowtails have yellowish spots on the body and orange spots on the wings are in a different place. Often, you can see faint banding from the stripes on the wings. You can compare here: http://bugguide.net/node/view/2636