Mayhem 1959 Journal 43. Apr. 29 5 mi. N.W. of 1000 Palms, Riverside Co., Calif. By 0927, then began to look for animals. When the first adult animal we saw in the dunes was a Diposaurus dorsalis, I realized we had arrived too late to get an adequate sample of Uma inornata, the species we were primarily interested in acquiring. Nevertheless, we were able to capture a total of 18 animals before we quit (at 1215) - 9 Diposaurus (3 adult σ?, 2 adult ♀, 3 immatures [sex?], and 1 very small juvenile); 9 Uma (4 adult σ?, 3 adult ♀, 1 immature σ?, + 1 immature ♀). By 1130 (air temp. [1cm] - 41.0°C., soil surface temp. -56.0°C.), the only Uma we could find were those we disturbed from the sand near the bases of creoste bushes on the lee side (in relation to sun) of each bushes. Rarely were we able to catch one of these, however, since they would usually run rapidly to the next bush + disappear under the sand before we could see where it went. At this same time (1130), the Diposaurus were either underground or sitting up in creoste bushes (1 case seen). When we stopped looking at 1215, various temps. were: air temp. (30") - 39.5°C. " " (1cm) - 42.5°C. soil surface temp. - 59.5°C.