Swallowed-Tail?

 When I first came upon this butterfly in the same patch of Daisies where I'd been photographing spiders for over a week, I thought it was a Pale Swallowtail.  But, I decided to wait a while for it to come around the flower so I could get a full view of its back.

 After four or five minutes went by, I saw just a little movement.  A colleague stopped to say Hello and ask what I was doing.  I said "waiting for this butterfly to come around to the front of the flower.  As she left, she said "Good luck with that," probably not believing it would happen.  I waited at least five more minutes; then it happened.  I'm glad I waited.  It turned out to be a closely=related new species, A Pale Swallowed-tail. :)