Callisaurus draconoides Sept. 8 3 mi. S.E. Joshua Tree P.O., San Bernardino Co., Calif. In and near large sandy wash collected three individuals. Dominant vegetation was Catclaw and Desert Willow, with some Burro Brush on the wash margins. Temperatures were as follows: Callisaurus = 40.8° C. sand = 38.9° C. 6" above sand = 32.0° C. (shade) Callisaurus = 41.2° C. sand = 49+° C. 6" above sand = 38.5° C. Callisaurus = 40.8° C. sand = 46.5° C. The animals were very active, some ran as much as 50 ft. away, disappearing still on the run. Animals which stopped while still in view were not observed to show the tail-waving action commonly observed by me in animals observed near Tucson, Arizona.