Quast, 1948 Journal April 17th E side Cocopah mts., 21 mi S.S.E. Mexicali, Baja California. 9:05 A.M. Camped 1/2 mile west of Mexicali - San Felipe road on alluvial fan of sand and rock on east side of Cocopah mountains. The wash has several species of low cactus growing among ironwood, ocotillo and creosote. No grass dry or fresh is visible in the wash and dry grass found but rarely in the dry surrounding hills. Minimum temperature last night was 48 1/2 deg F., temperature at 7:00 A.M., 56 deg F. A strong wind blew all day yesterday and up till about 2:00 A.M. The sky was clear yesterday and is clear this morning, a breeze is coming up at this time of writing. Of 500 traps placed in center of wash (alluvial fan) five were sprung and only two contained specimens, both of which were Dipodomys merriami. Tevis, Murray, and Dr. Benson caught Perognathus spinatus & baileyi, Peromyscus eremicus & crinitus, but no Dipodomys merriami. April 8 Punta San Felipe, 50- ft., Baja California. 9:15 P.M. Arrived this camp about 5 P.M. yesterday. We are located about 2 mi east of the town of San Felipe about 200 yards from the beach. We are about a mile from the end of the point which lies NNE of us beneath a rocky hill in a group of hills some of which are an estimated five or six hundred feet high. The nearest