Burnettweldia plumbella (Hymenoptera: Cynipidae)
Beaked Twig Gall Wasp
Las Trampas Regional Park, Contra Costa County, California
September 16, 2007

Also in this photo are numerous Andricus parmula galls, and the 'Pink Bow Tie Gall Wasp' (per Ron Russo's Field Guide to Plant Galls of California and other Western States). The Pink Bow Tie Gall Wasp has not yet been scientifically described. These galls are on Quercus berberidifolia (scrub oak).