Erichson 1934. nestoma auripila 9 mi. east of Papago Well, 1100 ft., Pima Co., Ariz. Feb. 4. No. 292 taken at lower end of rock slide, near palo verde tree from which bark eaten and twig cut. Cutting under rocks of slide. Tail broken off some time in past, healed at time trapped. Rat house of type used by N. altigula 25 ft. below point where these specimen taken. No. 293 taken on trail running along rocky ledge. Trail comes from top of rat house formed of an accumulation of sticks and cholla joints in crevices of rocks; 3 other traps near untouched. No. 294 taken under palo verde tree, a few old cuttings scattered on coarse gravel surface, some small rocks near; cuttings numerous under rock slide 25 ft. higher up on slope. 6 houses of type described found on hill on which traps set.