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Photo#677175
Willow caterpillars

Willow caterpillars
Chilliwack, British Columbia, Canada
July 19, 2012
Size: About 2 cm
They were eating the native willow I planted last year and when I touched the plant they all stuck their behinds in the air. They had 7 sets of prolegs (counting the one on the end).

Moved
Moved from Nematus.

Moved
Moved from ID Request.

Tenthredinidae, Nematinae
Nematus sp. A number of species of this genus feed on willows. Larvae of all cannot be identified.

Sawflies
They look like these ones: and a lot like this one:

 
Neat!
I think mine are a different species (maybe) as my little guys do not have any hairs, but knowing they are sawflies is good!

 
I think...
That yours might be the second species I showed because it was also on willow, it didn't have hairs, and it stuck its behind in the air (probably a defense posture).

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