Sorry for the recent barrage of emails but here is another. I believe these are the Palamedes Swallowtail. They were in full abundance at a state reserve near Orlando Florida.
Your emails swarmed into our mailbox in more abundance than the performance enhancing drugs, fake rolexes and porn sites. We really had to pick and choose and we are going for your lovely Palamedes Swallowtail, Papilio palamedes, which is a new species for our archive. This southern species is fond of swamps and though it superficially resembles the black swallowtail, the yellow band on the hind underwing is quite distinctive, and your image showcases it beautifully.