Hummingbird and Butterfly Gardening: Larvae ID Please, 1 by Sheila_FW

Sheila_FW wrote:
I took the liberty of re-posting your pic, hope you don't mind.

Definately a strong possibility on the Spicebush. Read what the comparison site says about it.

Quoting:Spicebush Swallowtail
Papilio troilus (Linnaeus), 1758


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Identification: Wingspan: 3 1/2 - 4 3/4". Superficially similar to Black Swallowtail (P. polyxenes), the other commonly observed dark swallowtail in Massachusetts. However, readily distinguished by checking the orange pair of spots on the inside corner of the hind wing (visible both above and below). In Black Swallowtail, this spot has a black center; in Spicebush it is clear orange. Marginal spots along fore and hind wings above are whitish to pale blue-gray in Spicebush; yellow in Black. Male Black Swallowtails have a bold yellow submarginal band across both fore and hind wings, which Spicebush never shows. The hind wings of male Spicebush above are a distinctive grayish or greenish blue, never present in Black.