either Pipevine or Spicebush Swallowtails mating.
I took this picture earlier today in the Great Smoky Mountains National park of two Swallowtails mating that i thought turned out pretty good. they were right in the middle of the road (well, almost more of a driveway). i thought that was a weird place for them to mate. well hopefully this will be of use to your bug love page. anyway hope you enjoy it.
These are mating Pipevine Swallowtails, and your photo is wonderful