Peterson 1935. Peromyscus m. sonoriensis. July 20. ½ mi. W Debbs Creek, Pilot Peak, 6000ft., Elko Co., Nev. Four caught in same dry canyon bottom as per July 19. Might add that parts of canyon bottom damp + some exposed water in one place supporting dense growth of willows and creek dogwood (?). July 21. Cobre, 6100ft., Elko Co., Nevada. Forty two specimens caught on gently rolling slight slope, gravelly with patch of sand + covered with sage brush + few junipers. Area notorious for large Peromyscus population, as place 18 mi. NE Iron Point used for Onychomys population. Note that 42 were caught out of 70 sets. July 22. [4 mi. W Hallock, 5200ft., Elko Co., Nevada.] None caught: place notorious for absence of Peromyscus. July 23. 6 mi. SW Mountain City, Cobb Creek, 6550ft., Elko Co., Nev. Four caught amongst grass under aspen in canyon bottom near creek.