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Andricus atrimentus
2222_2689 Photo added 2015-09-20

Andricus atrimentus (Hymenoptera: Cynipidae)
Striped Volcano Gall Wasp
near Regency Gate, Mt Diablo State Park, Contra Costa County, California
February 22, 2015

Host is Quercus douglasii (blue oak). This is a very fresh spring generation gall of this species.

all photos and text © Joyce Gross