Mayhew 1960 Journal 57. Aug. 8 Colorado Desert area, Riverside Co., Calif. at 0910 Frank Aubry, Bob Lasiewski, Walt Mofely, Ray Folmer, Kurt Pickus, & I left UCR in 2 vehicles (Cany-all & 1958 Chev. station wagon). We stopped about noon near the Riverside - Imperial Co. line to check over the possibility of setting up an experiment on Uma at Bat Cave Buttes. We walked about a mile to the buttes. One adult of Uma notata was seen & captured, which essentially eliminated the area for consideration for the project we had in mind. Glamis area, Imperial Co., Calif. We then drove onto this area to begin collecting. We drove slowly down the road for 1/2 hour between the Highline & Coachella Canals, looking for animals (1540 to 1610). Lots of hatchling Uma notata were seen. Sunset occurred at 1830 and several Uma were caught before that time. We began night collecting at 1945 by driving in shifts - one crew was on the road all night. Kurt & I drove until 2200; then Walt & Ray drove until 2400; Frank & Bob followed until 0200; finally Kurt & I drove until 0700. Three Coleonyx variegatus hatchlings were seen tonight, as well as 3 Crotalus cerastes (adults). Only a few adult Coleonyx