Nematus ribesii on Ribes divaricatum - Euura ribesii
Snohomish, Snohomish County, Washington, USA May 21, 2017 Size: 3/4" - 1"
There are a number of these on my native Gooseberry (Ribes divaricatum) this year and they are doing a reasonably good job of defoliating some of the branches.