Mayhew 1960 Journal 55. July 16 Mojave Desert, San Bernardino Co., Calif. We set out 11 mammal traps at our campsite, then ate dinner. I took two groups night collecting after we ate. In all, I drove 80 miles night collecting. We saw 1 Crotalus cerastes, several Hadrumus hirsutus, 1 Canis latrans, 1 DOR Chionactis occipitalis, + 1 Colonyx variegatus. We night collected from 2015 to 0110. July 17 We arose at 0530 + checked the mammal traps. Seven of the 11 traps contained animals (3 Peromyscus sp., 2 Perognathus sp., + 2 Neotoma sp.). After breakfast we looked for Sauromalus obesus (caught 3) + Crotaphytus collaris (caught 3) on the rocky slopes. We also marked a tortoise near the top of a small hill just west of camp that was taken from a burrow occupied last year by a marked animal (#6). Later we marked 2 more Gopherus agassizi in the flat creoste rock scmb near the Barstow - Lucerne Valley Road. We also caught several lizards there (Uta stanshuriana, Urosaurus graciosus, Callisium diaconides, Cnemidophorus tigris, Phrynosoma platyrhinos). When the animals became inactive near the middle of the day, we returned to Lucerne Valley. After lunch, we head for UCSB, which