P. Richardson 13 II 1 Peromyscus californicus, californicus. 4 mi. E Stadium, 700 ft. Berkeley, Alameda Co., Calif. Caught said individual well in a deep brush thicket. This thicket extended along the moist banks of a stream for at least 100 yd each way and with an irregular depth of about 25-100 ft. This dense cover was composed of thistle species, elder-bushes, creek dogwood, alder, ferns and other herbaceous plants. There was a good deal of litter mixed in with this vegetation giving it a dense appearance. There was a broken canopy overhead that prevented evaporation, leaving the ground in a moist condition.