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Sawfly - Monsoma pulveratum

Sawfly - Monsoma pulveratum
Vancouver, Clark County, Washington, USA
April 1, 2010
Size: 8-10 mm
Looks like a member of Tenthredinidae (common sawflies) family.

Images of this individual: tag all
Sawfly - Monsoma pulveratum Sawfly - Monsoma pulveratum

Moved from ID Request.

Tenthredinidae, Allantinae
This is Monsoma pulveratum, an alder feeding sawfly. A European sawfly that was first found in N. Amer. in Newfoundland 10-15 years ago, and just the last few years in Alaska where is it quite a serious pest of alders. I've not seen this from anywhere else in N. Amer.

Monsoma pulveratum
Dave, thank you very much for your ID! There are a lot of alder trees in that place, but that was a first time when I've seen this sawfly there. So, looks like it's coming to the Pacific Northwest:)
Could you please move it to the species page?

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