On this date, it almost certainly is where you are. But, when in doubt, in eButterfly there is a "Tiger Swallowtail sp." on the checklist you can use too. That just means it was one of them and you didn't ID it or you were unable to determine.
Kent McFarland Vermont Center for Ecostudies PO Box 420 | Norwich, Vermont 05055 802.649.1431 x2