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Photo#6895
Spotted caterpillar - Nematus ventralis

Spotted caterpillar - Nematus ventralis
Moline, Illinois, USA
August 21, 2004
These were all over a plant, but I'm not sure what the plant is. They were near a body of water, right on the edge. When they felt threatened, they would arch their head out away from the plant in an "S" form.

Moved
Moved from Willow Sawflies.

Tenthredinidae, Nematinae, Ne
Tenthredinidae, Nematinae, Nematus ventralis Say - a willow sawfly

Moved
Moved from Sawflies.

Sawfly larvae
These are sawfly larvae of some type. I can tell by the defensive behavior (that's the tail in an 'S', btw) and by the presence of more than 5 pair of prolegs. I haven't seen any like these. I think one of our contributors knows sawflies well and maybe he'll offer something more specific.

 
Willow sawfly?
Maybe that's willow? Several species I found in the genus Nematus have this general appearance. Here's one:
Willow sawfly

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