Small Staphylinid beetle
Collected in Valley Springs area, Calaveras County, California. 10 January 2017.
This small staphylinid beetle, or rove beetle, is about 3 mm long, was in a bathroom wall, foraging near bathtub. They were finding many of these beetles.
It is in the tribe Xantholinini.
Thanks to Lynn Kimsey for the ID.
Click to enlarge.