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Photo added 2007-09-28
Callirhytis serricornis
(Hymenoptera: Cynipidae)
(Synonym: Andricus serricornis)
Kernel Flower Gall Wasp
Del Valle Regional Park, Livermore, Alameda County, California
September 23, 2007
Exit hole of wasp visible in middle gall. On Quercus agrifolia (coast live oak).