Mayhew 1964 Journal 12. Sept. 10 Hesperia, San Bernardino Co., Calif. Al Bennett, Shirley Hill & I left UCR at 1030 to get some observational data concerning the times that Sceloporus magister are active in the afternoon during September. We drove the roads in and around Hesperia from 1110 until 1715. A number of S. magister were seen during this period. We tried to capture only a few that we saw, however. We were successful in capturing 4 adults (2?, 2?) during the day. We returned to UCR at 1745 after travelling at total of 131 miles. Sept. 28 Dale Dry Lake, San Bernardino Co., Calif. The September temperature records for Uma Scoparia were considerably lower than for adjacent months (including October), so Shirley Hill & I left UCR at 0910 to check on the situation. We captured 22 U. scoparia between 1110 and 1600, and measured the cloacal temperature of each. All of these temperatures were in the range of temperature measured during other months, suggesting our previous September sample was not typical. We reached UCR at 1915 after a trip of 225 miles.