Hiker's Guide to the Trees, Shrubs and Vines of Ricketts Glen State Park (PA)

Hiker's Guide to the Trees, Shrubs,
and Woody Vines of Ricketts Glen State Park
Spicebush Swallowtail (Pterourus troilus) (Papilionidae)
On various members of the Lauraceae - here on Sassafras albidum.

Updated 3 May 2017.