Mayhew 1964 Journal 9. Sept. 2 Glamis area, Imperial Co., Calif. black sand does a short time after the tide has receded. After getting the needed information on Uma notata and Urosaurus gracilisus activity in September, we drove to the eastern edge of the dunes to get some soil temperature measurements that the referee for my Scaphiopus couchi paper felt were needed. I dug a hole in the sand under the dense shade of a palo verde (Cercidium floridum) where the shade was essentially permanent (north side of tree). Then I measured the soil temperature 50 cm. beneath the surface, since this was the deepest at which I found the permanently moist layer. At the same time, Al Bennett dug a hole in the sand that was exposed to the sun all day. This spot was about 30 feet from my hole. We measured the soil temperatures at the same depths at the same time. The readings were: Shade Sun 30.8°C 34.9°C At the time the air temperature (1 meter) was 35.4°C. If the same measurements had been made at