Several buzzing around between the scrub oaks. Not very confiding though, so had to catch one for most of the images.
This looks like abdita based on MPG plates, and it is regular in southern CA.
For everyone's convenience, here is a quick link to the genus in CA:
http://mothphotographersgroup.msstate.edu/pinned.php?plate=30&page=3&sort=h&state=CA