Murray 1948 Journal July 6 10 mi SE Mesquital, 400± ft, Baja Calif. Trapping in the new ground was unsatisfactory. Caught 1♂, 2♀ Perognathus arenarius, and 1♂, 1♀ discarded. All of these were in silt but one, and this very close to sand on the bottom of the cliff. Also took 1♀ Perognathus spinatus among the rocks on the cliff. Found I had caught 1 Thomomys bottae but it was ruined—kept skull only. Yesterday afternoon scared up a great horned owl from the cliff side. At about 10:30 AM went on an extended search for Citellus leucurus. Started off to the north, going past the wash and into mostly rolling ridges with washed gullies between. These slopes were almost all rocky and there were many stream cut banks, all appearing favorable for the squirrels but bearing none that I could see. Finally circled around and came back along the wash from the northwest, still following rocky banks. Along one saw three squirrels, two of them together. These were exceedingly timid and rushed away while I was still quite far away. One took off down the wash and ran fully 50 yards—and may still be going