Arnold 1937 Perognathus formosus Warm Spring, Lassen Co., Calif. May26 Two caught by Fitch in rocky locations N.W. of here. May30 1 mi. NW Pahran Ph., Washoe Co., Nevada: A single ? was caught by me in the hard packed scantily brushed area on the E side of Smoke Creek Desert. It seemed to prefer more rocky, rough ground than the other Perognathus thus far caught. The desert at this point was strewn with black volcanic rock. These ranged from the size of a pea to that of a cantalope.