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Photo#382435
Sawfly Larvae - Cimbex americanus

Sawfly Larvae - Cimbex americanus
Georgian Bay, Muskoka, Ontario, Canada
August 28, 2009
Size: about 2 inches
I believe this is the larva of a large sawfly from the family Hymenoptera (Cimbicidae) but do not know the species. Any help is appreciated.

Moved
Moved from ID Request.

Cimbicidae indeed, genus Cimbex even
... other than that I should keep quiet - I even have trouble identifying the larvae of the European Cimbex species. On BugGuide there are quite a few images of white Cimbex larvae identified as Cimbex americana, but I'm totally ignorant both on characters to look for as well as body doubles :o|

Move to Cimbex should be good though.

P.S. For further ID an indication of the host plant might be helpful - the larva is obviously feeding, so presumably on the right plant/tree.