Peterson 1935 Peromyscus m. sonoriensis. Marys River, 5800ft, 22 mi. N Deeth, ELKO Co., Nevada. July 8. Seven caught on gravelly slopes sparsely covered with low sage brush. Peromyscus apparently more numerous + more universally distributed than any other species - larger percentage of them caught consistently than the rest. Seem to inhabit + ply close & shrubs rather than in the open. (A survival promoter? Less suscept-ible to destruction by predators?) carry ectoparasites - lice, mites. July 9. Marys River, 5800ft, 22 mi. N Deeth, ELKO Co., Nevada. Eleven caught on dry gravelly flat covered with sage brush + along fences + dry ditch on Buena Vista ranch. July 10. 15 mi. S Contact, 5800ft, ELKO Co., Nevada. Nine caught on gravelly, gentle slope covered with sage brush. Most numerous in tall sage brush. next + young July 12. July 11. Goose Creek, 5000ft, 2 mi. W Utah Line, ELKO Co., Nevada. Twenty one caught on river flat, gravelly slopes covered with sage brush. July 12. Goose Creek, 5000ft, 2 mi. W Utah Line, ELKO Co., Nevada, Five caught on river flat near banks.