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Andricus atrimentus
2222_2690 Photo added 2015-09-20

Andricus atrimentus (Hymenoptera: Cynipidae)
Striped Volcano Gall Wasp
near Regency Gate, Mt Diablo State Park, Contra Costa County, California
September 4, 2015

Host is Quercus douglasii (blue oak). This is a spring, bisexual generation gall of this species, with an exit hole where the wasp has emerged.

all photos and text © Joyce Gross