Mayhew 1959 Journal 56. May 22 Algodones Dune area, Imperial Co., Calif. We began night collecting at 1900. a total of 17 Colonyx variagatus (10 ♂ and 7 ♀) were captured between then and 2320, although we drove to the end of the pavement east of Slanios and back to the canal nearest Brawley on the Slanios Road, all but one of the animals were captured in the creosote bush scrub habitat between the two canals (the other animal was captured in the dune area near our Urea collecting site). They were still active when we quit for the night. Each time we drove between the 2 canals (a total of 6 times) we found additional animals. Two Crostalus cerastes were seen on the road (1 had just been run over, the other was alive), but no other reptiles were seen after dark. We drove a distance of 250 miles today, 84 miles of which were for night collecting. The minimum temp. tonight was 60° F. May 23 We arose at 0730 and ate breakfast. I gathered soil samples from 0830 to 0915 while Bert looked for lizards. They were already active when we walked into the field at 0820. We looked for lizards until 1200, when we had to return to the car for more sacks (I was carrying 1 Urea and 2 Ursoaurus in my hands because I had no place to put them). After we