JE Simpson 1938 56. Caborca, Sonora April 24, 1938. Bathed in irrigation ditch and broke camp for Puerto Libertad. Drove 5.2 mi. to Pitiquito, 24.3 mi. to Bamori, here took the larger but wrong road (very often a road forks off with no indication of the ultimate of either) which took us to LaCienega where we had lunch and found our error. It was necessary to return to Bamori then 6mi. to Puerto Calaveras. Along road Dr. Benson noticed kangaroo-rat mounds that looked like those of D. spectabilis None having been recorded from here; so we made camp in vicinity of mounds: 1900 a.m., 16.7 mi. SW Bamori, Sonora Set 7 rat-traps, 10 Shuyler traps, 4 #91 jump-traps for the banner-tailed kangaroo rats; also set out 50 mousetraps after dark. April 25, 1938. Caught 1 Perognathus amplus (sp?) (o7239), 1 Perognathus baileyi (o7240), 1 Onychomys torridus (o7241), 4 Dipodomys spectabilis (o7242, 243, 244; ♀245), and 11 Dipodomys merriami (8o75 and 3♀b). Cheek-pouch contents of pocket-mice and kangaroo-rats saved. The terrain here is level, of rocky, gravel surface, and covered well with vegetation: creosote, palo verde, palo fierro, and saquaro mainly; some cholla, turcote, bara blanca, barrel-cactus, cardon, and grass. There was some doubt in our minds about the exact location of this camp—the hills without