1973 June 28 5 mi. N. Benton Station, Mono Co., Calif. Arrived about 3:00 P.M. in a sagebrush flat some 5 to 5½ mi. N. Benton Station on Hwy 6. A survey of the area revealed few holes, but in view of the time, we decided we would have to camp here. The presence of D. microps in a sagebrush locality would be significant anyway. We drove on to make camp at Montgomery Pass, el. 7160 ft., in Nevada among Pursh and juniper. We returned at 7:00 to set traps perpendicular to Truman Meadows Road some ½ mi. n. of Hwy 6 and 6 mi. N. Benton Station. We set 73 ten inch Sherman live traps baited with oatmeal. We left at dusk June 29. We had fair luck, catching 17 animals of 9 species—more or less. Three varieties of Perognathus were present, a small silky one (longimembris), a medium size of moderate pelage stiffness (= pervex) and a quite large one that appeared silky. Four Dipodomyss were cought, no sexes being visible in my eye for three of them, the other being ordis. A Nestoma, 2 Perognathus, perhaps of different species, were caught as well, and a Harvest mouse max Tabber. We collected plants, both sage and