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Photo#826616
Poison Ivy Sawfly - Arge humeralis

Poison Ivy Sawfly - Arge humeralis
Groton, Middlesex County, Massachusetts, USA
August 18, 2013
About a dozen of these sawfly larvae were feeding on a poison sumac in my yard. I didn't know what the plant was until after I identified the larva on bugguide and looked up its foodplant. Next thing I did was start washing my hands:-)

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Poison Ivy Sawfly - Arge humeralis Poison Ivy Sawfly - Arge humeralis Poison Ivy Sawfly - Arge humeralis