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Green caterpillar in Ohiopyle State Park, Fayette County, Pennsylvania, USA
I don't think that is the underside. But I am not sure, it was spotted a while ago before I joined PN.
if that is the underside of it, itll be pretty hard to identify..
Lat: 39.87, Long: -79.49
Spotted on Aug 8, 2010 Submitted on Aug 8, 2010