Nice pictures, Ken.
The
P. canadensis that NikonUser speaks of is another great example of how names change over time. When I was a kid, all of the eastern and northern populations were lumped together and known as
Papilio glaucus. After a while, it became clear that there was almost complete reproductive isolation between two big groups, which then got split into
canadensis and
glaucus. Sometime in the last few decades, the whole Tiger Swallowtail group got split off from the Old World swallowtails, forming a new genus
Pterourus. Then on review of the recorded play-action, the referees decided there wasn't enough difference to support splitting, and pushed everything back into
Papilio. Unlike sports, decisions of the zoology referees are never final, so I would not be surprised to see the names revised again at some future time.
--Rik