V. Memmler 1942 Perognathus April 4, Mudcreek, 500ft, 3 1/2 mi. SW San Juan, Santa Cruz Co., Calif. One ♂ Perognathus was caught in one of 134 traps set around an Artemisia Californica covered hill. Microtus californicus, Peromyscus californicus and Peromyscus (magniculatus) were also caught. There were 24 traps sprung during the night, probably partly due to a heavy rainfall. Nuts were used as bait. April 8, Muddy Creek, 1000ft, 1 mi. S Chualar Canyon, Monterey Co., Calif. One ♂ Perognathus was caught in one of 127 traps set in Dry Chaparral along a dirt road in a narrow V-shaped canyon. Salvia mellifera is the dominant plant with much Artemesia also present is Baccharis and Rosa. Short grass covers the ground except where sand drifts are peeled. April 10, Chualar Canyon, 500ft., Monterey Co., Calif. 5 ♂'s and 1 ♀ with no embryos were caught in one of 120 traps set on the margin of a new wheat field where it meets the Artemesia covered slopes of the canyon wall. Three had been mutilated, probably by a predator, in the head region. We were therefore unable to save them as specimens. These were the only mutilated specimens in the trap line which caught a total of 53 animals. Two of these mutilated were close together, but the third was at some distance away.