auto, Knox 1976 journal January 24 12 3/4 mi. w. Landsberg, Kern Ca. California. To 3 ft in height in places, with much hard packed ground in between. The soil was mixed alkali-hard pan and sand, one factor being more important the other. Occasionally we would come across "humrow" complexes, often elevated in a ring of leafless bushes. These are reminiscent of L microp humrows in Arizona. The traps were baited with wheat fluid mix. Shortly after nightfall the temperature dropped rapidly to 40°, then below freezing. At 1:30 am I checked Traps, the temperature being -30°. I cought 6 L microps and 4 D. merrisii on this run, being finished at 3:30, -70°. at 6:30 I ran the traps again, at -9°, and caught 6 D. merrisii and 1 L microps. Total catch consisted only of two species, 7 L microps and 10 D. merrisii. The former seemed to centralize it's activity in the first half of the evening, where D. merrisii was active the whole night. A 1/2 moon rose about 3:00 a.m., and temperatures warmed rapidly in the sunlight the following morning. Left for Berkeley about 9:30 a.m.