Cool pic!

I would venture to guess it is a Spicebush Swallowtail (those blue spots makes me think that's what it is because Giant Swallowtails don't have them) although why it is on a Serviceberry, which is a member of the Ruta family, is beyond me. You see, GSTs would eat members of the Ruta familyÂbut Spicebush Swallowtails wouldn't!

I think its a Eastern Tiger Swallowtail. I have found their eggs on Umbrella Magnolia, Wild Cherry and Tulip Poplar. I have seen them do the web bed as well. I have never seen Spicebush on a web bed.

Super pic

Sam

I'm positive now it was an Eastern Tiger Swallowtail. The one in the photo disappeared (probably eaten by a mockingbird while it was cleaning out the berries), but there are two more in later stages right now that I can match to photos of other Eastern Tiger Swallowtails. They definitely grow MUCH slower than the Black Tiger Swallowtails. Hopefully these will make it to the chrysalis stage. Thanks for pointing me in the right direction.

Tim