Taken from 20 watt UV light bucket trap.
Elevation 700', GPS = 38.8198, -121.1173.

I think this is Homaeotarsus sp. keyed in Arnett (1).
Unfortunately, I don't see any species keys except for 1905 Paederini key by Casey which is too out of date.

No BG posted specimens of Homaeotarsus are from CA.

Important characters:
-- Slightly oblique epipleural carina above lateral margin of elytra (arrow).
-- Apical maxillary palps conical.
-- Geniculate antennae.
-- Intersegmental membranes of abdomen with "brick wall" pattern.