DESimpson,1938 24. 2650ft., LaMision, 2 mi. w. Magdalena, Sonora March 17, 1938, continued. Setting trap-line over top of rocky hill crept up to 40 feetof within SIX black vultures loafing on rocks at high hill-top. at 4:30 PM; they flew to adjacent hill-top to alight on rocks. Birds commonly seen in this area: Phenapeplas, ravens, black vultures, turkey vultures, cardinals, linnets, doves, red-tail hawks, small flycatchers, and other unknown tome. Took apart three woodrat nests on hill-top among large rocks (same hill-top where above mentioned black vultures rested). Two were small (less than one cubic yard of sticks piled up) and built to side and under large rocks; borrowns into rocky earth found in each. The third was much larger (mostly concealed under very large(10ft) rocks; a storage place was excavated of about two cubic yards of various cactus debris and seeds and fruit (only about 1% fresh, green foliage). Much of this material was the spined seeds and fruit of cactus—very difficult to handle and must be somewhat so to the woodrats. The house material was mostly of mesquite sticks, but among it was commonly cholla with its dangerous spines. The three houses were in a triangle the sides of which would measure less than thirty feet. In the vicinity of the houses saquaro, cholla, mesquite, creosote, and ochotillo were the dominant plants; portions of each of these could be found in the houses and storage.