T. Rickman found two pairs of these spiders under rocks and collected them, later sending them to me for ID and to donate to CAS as specimens. They match up nicely to C. sierra/gertschi in Leech 1972, I think - the males of those two species are apparently almost inseparable while the females should be separable by the epigynum, but I am finding it hard to be certain which species we have here... I think I favor sierra somewhat, but that species is only known from one NV locality, while Leech mentions specimens of gertschi from closer to this locality. Hope to compare with reference specimens at CAS if we have both species there... Comments or corrections welcome.

Live images of one of these spiders from T. Rickman is at iNat here:
https://www.inaturalist.org/observations/95328054