leaf beetle - Trirhabda flavolimbata
Waddell Creek near coast (a part of Big Basin Redwoods State Park), Santa Cruz County, California, USA
July 26, 2009
I'm posting this so Bugguide has a record of the plant this beetle is on, Baccharis douglasii. Aaron Schusteff id'd the plant and found the beetle. I'm assuming the beetle was not just "passing through" -- she seemed quite content to stay on this particular plant despite my bothering her.
Other Trirhabda flavolimbata in the guide so far have been photographed on Baccharis pilularis.