And this time, it's one I've been looking for since last year, the Pipevine Swallowtail (Battus philenor). This is reputed to be the distasteful and toxic species (a result of eating Pipevine), that has caused several other more familiar species (at least to me) to evolve as its mimics. These include the female dark morph Tiger Swallowtails, the Spicebush Swallowtail, the Black Swallowtail, and the unrelated Red Spotted Purple, all of which I have seen here.
I even made a short video. Sorry about the lawn mower noise; no need for the sound. There is also a brief appearance of the Spicebush Swallowtail.