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Species Pristiphora geniculata - Mountain Ash Sawfly

Now I know these are Sawfly Larvae! - Pristiphora geniculata Pristiphora geniculata Pristiphora geniculata Pristiphora geniculata Larvae eating Mt. Ash - Pristiphora geniculata Mountain Ash Sawfly  - Pristiphora geniculata Mountain Ash Sawflies - Pristiphora geniculata Mountain Ash Sawfflies - Pristiphora geniculata
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Symphyta" - Sawflies, Horntails, and Wood Wasps)
Family Tenthredinidae (Common Sawflies)
Subfamily Nematinae
Tribe Nematini
Genus Pristiphora
Species geniculata (Mountain Ash Sawfly)
Explanation of Names
Pristiphora (Pristiphora) geniculata (Hartig 1840)
Range
native to Europe, adventive in NA; widespread in ne. US & Canada; "common east of the Mississippi River"(1)

First detected in Washington State in 2009, and now common throughout the Puget Sound region
Season
Jun-Sep
Food
Main host: Mountain-ash (Sorbus)
Life Cycle
Overwinters as cocoon in the dirt. Two generations in the south, one in the north. First generation usually emerges in June and the second at the end of July.
Remarks
larva can cause extensive damage to leaves but rarely kills the host
earliest record in our area: NY 1926
Print References
Looney, C., Smith, D. R., Collman, S. J., Langor, D. W., & Peterson, M. A. (2016). Sawflies (Hymenoptera, Symphyta) newly recorded from Washington State. Journal of Hymenoptera Research, 49, 129.
Internet References