This guy was found speeding across a coworker's desk. He was very active, and didn't want to cooperate for the camera. Had to shoot through the plastic lid of the petri dish. For scale, the grid on the bottom of the dish is 13mm squares. Length from head to tip of abdomen approx. 6-7 mm.
Location: Placerville, CA.

UPDATE -- This has been tentatively identified as a male Tibellus chamberlini