Evans & Hogue 2006 says there are only 10 species in CA! Imagine that, a beetle family with only 10 species anywhere. Sadly, they don't list them all. This list extracted from that book.

Burying and Carrion Beetles - Photo (c) Victor W Fazio III, some rights reserved (CC BY-NC), uploaded by Victor W Fazio III Check list for Burying and Carrion Beetles (Family Silphidae)