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Papilio glaucus
Beautiful find!
The lack of light spots on the thorax and abdomen as well as the large amount of blue on the hind wings are more consistent with a dark phase, female Eastern Tiger Swallowtail. Please take a look at all of the links I have provided to compare images. http://bugguide.net/node/view/491
For comparison to a female Black Swallowtail: http://bugguide.net/node/view/510811/bgi...
http://bugguide.net/node/view/459428/bgi...
http://bugguide.net/node/view/2636