Mayhew 1958 Sept. 19 Journal 102. Colorado Desert, Calif. inornata were collected at this location by 0915, so we left. At this time, the air temp. was 37.6°C., the soil surface temp. was 55°C. We then drove through Indio, down the east side of the Salton Sea to Brawley, then 25 miles east of Brawley to the Sand Hills (Algodones Dunes or Yuma Dunes). We reached the Sand Hills at 1430. The air temp. at this time was 40.2°C., the sand surface temp. was 50.5°C. It was still too warm for reptiles to be active, so we drove 12 miles east of Glamis to the junction of the road with the Ogilby-Palo Verde Road. Then we back-tracked about a mile to a dry wash that contained many green mesquite, etc. We collected several specimens here. Among them were Uta stansburiana, Sceloporus magister, Callisaurus draconoides, Diposaurus dorsalis. Also seen in the area were Cnemidophorus tigris and Sauromalus obesus. We reached this area at 1550 when the air temp. was 37.8°C., & the soil surface temp. was 44.5°C. We returned to Glamis at 1745 and tried to collect Uma notata on the dunes. The sun went down at about this time. The air temp. was 34.7°C., &