Peterson 1935. Perognathus parvus olirous. 1 mi. N Winnemucca, 4600 ft, Humboldt Co., Nevada. July 2. Three individuals caught on clayey gentle slope close to + on W side of Humboldt River. A pocket mouse resembling other mice in body proportions. Color grayish with suggestion of tan. July 3. 4 mi. SW Winnemucca, 4500 ft, Humboldt Co., Nevada. Two caught on gently rolling gravelly slope covered with sage brush, Artemisia tridentatus. July 4. 1 mi. N Winnemucca, 4600 ft, Humboldt Co., Nevada. Two caught on sand dunes covered with sage brush to E of Humboldt River. July 6. Marys River, 5800 ft, 22 mi. N Deeth, ELKO Co., Nevada. Four caught on dry gravelly slope to E of Marya River covered with rather sparse low sage brush, and little grass. July 11. Goose Creek, 5000 ft, 2 mi. W Utah Line, ELKO Co., Nevada. Two caught at base of gravelly slope covered with sage brush. July 13. Goose Creek, 5000 ft, 2 mi. W Utah Line, ELKO Co., Nevada. Two caught on dry gravelly slope covered with sage brush.