Petersen 1935. Thomomys quadratus July 13. Goose Creek, 7000ft, 2mi W Utah Line, Elko Co., Nevada. Six specimens caught by Dr. Hall prepared by myself. July 24. 6mi SW Mountain City, Cobb Creek, 6500ft, Elko Co., Nev. One specimen caught with mouse trap at open burrow at foot of canyon slope above aspens in area having mostly grass + few sage bushes. July 29. 13mi N Paradise Valley, 6700ft, Humboldt Co., Nevada. One caught with mousetrap set at open burrow at base of canyon slope of Road Creek. Sopless, like Microtus to less degree Zapus, with considerable very loose connective tissue under skin permitting much free movement of integument. Very soft-bodied.