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Photo#1498259
on prickly ash - Derospidea brevicollis

on prickly ash - Derospidea brevicollis
Harms Woods Forest Preserve, Glenview, Cook County, Illinois, USA
August 11, 2017
Just a few at the end of the season, but there must have been hundreds because there was hardly a leaf left on the prickly ash.
Looks like a Papilio cresphontes egg