Longhurst 1939 Perognathus parvus June 28 11 mi. (NE Weed ft. Siskiyou Co, Calif. Pocket mice are found in abundance here on the more level sandy soil covered by sagebrush and antelope brush. A few were collected in the rocks at the base of a hill. Cheek pouches contained seeds of brome grass. Their burrows (only about 1m. in diameter) are much smaller than those of Dipodomys, and are more commonly seen about the bases of sagebrush. June 29 July 2 Crooked R., 3400 ft., at Mouth of Bear Cr., Crook Co, Ore. Perognathus are numerous about here. They were collected in practically all places traps were set: the sandy banks of the river; among dense sagebrush at the bottom of the canyon walls; under junipers on the canyon walls; and along rocky gullies on the sides of the canyon. Cheek pouches contained seeds of brome grass (sometimes called "cheat grass"). Burrows here were likewise mainly about the bases of bushes. July 3 E. end Miller's Island, 200 ft. Columbia R., Klickitat Co, Wash. Perognathus are fairly common here. They are most abundant in sandy soil, and along the sand dunes over covered by sagebrush and chrysotamnus.