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Old July 28th, 2011, 08:27 AM
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bendyfoot bendyfoot is offline
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Join Date: May 2007
Location: Ontario
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It's a sawfly! Not a real catterpillar at all, but a wasp larva! The shape of the head and the teeny eye are a pretty good indicator. You also said you found several? They tend to congregate in largeish numbers, sometimes putting on a pretty interesting "threat" display together if they're disturbed.

Knowing their host plant (what they were eating) would help narrow down the species a bit, but a quick search makes me wonder if it's the Elm Sawfly:

Cool critter!
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