Q. Chatter Perognathus parvus 3400ft. Crooked R! at mouth of Bear Creek, Crook Co., Oregon June 29 caught 5 P. parvus in 50 traps in sandy soil covered with sagebrush, also in higher rocky soil with sparse bunch grass cover. Columbia R. 300 ft.; at mouth of Deschutes R. Wasco Co., Oregon July 1 2 P. parvus caught on hillside covered with dry cheat grass. Maryhill, 200ft., Klickitat co., Wash July 16 - 3 ? P. parvus caught along slopes of a dry wash. Cheek pouch contents of 1 composed of seeds of cheat grass. July 18 Paterson, 250ft., Benton Co., Wash. Caught 39P.parvus in 90 mouse traps set in sand dunes near sagebrush. Cheek pouches contained seeds of cheat grass. Closed and open burrow mouths very plentiful. Tail tracks visible in sand are about H in. long and about 1/8 in. wide July 19 Block Island,250ft., Benton Co., Wash. caught 13 P. parvus in 42 mouse traps set 20 faces apart, in sagebrush growing in sandy soil. 2mi. SW Irrigon, 300ft., Morrow Co., Oregon July 20 caught 18 P. parvus in 63 mouse traps set 20 faces apart.