Mayhew 1958 Sept. 18 Mojave Desert, Calif. was 48°C. A number of lizards were seen, but none were captured. They were all extremely wary. Uma scoparia, Callisaurus draconoides + Cnemidophorus tigris were seen. We walked around over a portion of the Amboy lava flow, but found no lizards active except Uta stansburiana. These were quite dark on the lava. We tried to find Uma scoparia on the wind- blown sand among the lava blocks, but had no luck. We saw many tracks however. After eating supper in Amboy, we drove through 29 Palms to Garnet, then camped on the old highway between Garnet and 1000 Palms. Colorado Desert, Calif. Sept. 19 We broke camp at 0540, then drove to a spot 3 miles west of 1000 Palms where Frank & I had collected specimens earlier. At 0630 the air temp. was 25.7°C. the soil surface temp. was 25.6°C, although we looked diligently for animals at this time, none were seen until 0750, when an adult Uma inornata was seen. At this time the air temp. was 31.2°C. and soil surface temp. was 36.6°C, a wind of 3 miles/hour was blowing from the north-west. The relative humidity was less than 5%. Sufficient Uma