July 16 - Yuma Sand Hills, Imperial Co., Calif. Temperature for the night was 30° C. July 17 - Yuma Sand Hills, Imperial Co., Calif. We arose a 0500 this morning, breakfasted, and were in the field before 0630. The first lizard, a ? adult Uma notata, was captured at 0610. Temperatures were: (°C) Air 33.5°, 1cm 34.5°, Soil Surface 36.2°. Walt Moledy + Bob Losziewicz patrolled the road in the car and reported that the lizards were extremely skittish. Dipso- saurus would run from the road to a hole as soon as the car stopped, even before anyone get out. In the run between Glanis and the Highway canal only lizards, including one hatchling Crotaphytus vernalis, were collected. After 1000, when the air temperature exceeded 37.5° C, collecting became very poor. We left the area at 1200. (Air temp: 43°C) We left a lizard trap at near the Cochella canal