Erickson 1934 2 Neotoma lepida Tank located, trap under rocks forming protecting roof, cuttings and droppings present; no other rats taken in traps set at similar locations along canyon side, one trap set in runway in crevice, stolen; Desmopimus in two others set in runways in which floor littered with cuttings and droppings. New River Valley, 30 mi. N. of Phoenix, 1675 ft. Maricopa Co., Ariz. Feb. 11. No. 33 taken on east side of small much fractured and weathered granite hill, many large boulders near but no evidence of house in immediate vicinity, cuttings and sign found under rocks at other points on hill. 10 mi. east of Quartzsite, Yuma Co., Ariz. Feb. 27. Two individuals taken in traps set among rocks on east side of lava hill; no houses found in immediate vicinity, two taken at widely separated points.