Two-tailed Swallowtail

More pics and links for comparison and info. Western: http://bugguide.net/node/view/24573 Two-tailed: http://bugguide.net/node/view/23914

This link from BG might help. http://bugguide.net/node/view/429400

True Hiker it could also be a Western. Need an expert

It's definitely a swallowtail. It's hard to tell which kind because of the angle of the picture but it looks like it's most likely a two-tailed swallowtail. Also, the two-tailed swallowtail is the official butterfly of Arizona, where this one was spotted. http://www.statesymbolsusa.org/Arizona/state_butterfly.html

Tiger Swallowtail butterfly

Looks like a Two-tailed Swallowtail, but Arizona also has the Western Swallowtail which is similar. So I am sure someone can narrow it down