Aromas, San Benito County, California, USA July 2, 2008 Size: ~15mm
Seen on Heteromeles arbutifolia in our yard. (live oak/chaparral habitat). I thought I was photographing another Vespula, but after viewing the image and http://bugguide.net/node/view/35661, I think it might be Dolichovespula arenaria.