Erickson 1934. Tinajoso 1 Peromyscus crinatus Tinajas Altas, Yuma Co., Ariz. Jan. 13, 1934. a single individual, F, specimen no. 181, taken at an elevation of 1300 ft.; the height of traps set out for night. Taken on NE facing rocky slope in one of rock strewn gullies between solid though eroded rock ridges. Taken under a sheltering rock, [illegible], which with others formed a small cave; some loose soil but mostly rocks; two clumps of a small woolly fern = Notholaena barzi under rock. Vegetation in region, ocotillo, Palo verde, yucca, and 4 other bushy kinds of plants. Tinajas Altas Jan. 14, 1934 6 specimens, presumably, referable to this species secured. Nos 187, 188, in locations slightly higher in gully, but in very similar conditi. locations; (under sheltering rocks, ferns present), to one taken on 13th. No. 189 taken at lower end of steep narrow - 3-6 ft. wide rock slide, under a bushi., a little soil and many small rocks in vicinity. No. 190. taken at top of slide from whil 189 secured, no traps between these two elevations; on narrow sloping ledge between in long steep rocky slope facing almost due N. Trap set between rocks; no loose soil near crest of range, or plants near. No. 191 taken on rock strewn slope below- base of highest peaks of range, under bee sage bush, hole between two rocks within a few feet of trap. No evidence of breeding in any of specimens taken. All specimens Jan. 13 and 14 taken in same draw of NE facing slope at south of tanks.