Callirhytis serricornis (Hymenoptera: Cynipidae)   (Synonym: Andricus serricornis)
Kernel Flower Gall Wasp
Anthony Chabot Regional Park, Alameda County, California
June 26, 2007

On Quercus agrifolia (coast live oak). This is the summer unisexual generation of the wasp. The spring bisexual gall is shown here.