JESimpson, 1938. 1400±ft., (mi.) Batuc, Rio Moctezuma, Sonora. May 22, 1938. Caught in mousetraps 1 Perognathus goldmani (σ♀408), 4 Perognathus penicillatus (σ♂409-411), and one jv. Dipodomys merriami (not saved). Put up specimens, broke camp, and drove 2.4 miles thru Batuc, 4.2 miles to Tepupa, 1.5 miles to Suaqui, round-trip to Tepupa to Suaqui, and 7.7 miles to camp near Rancho El Ojito: 1400±ft., El Ojito, 6 mi. NE. Suaqui, Sonora. May 22, 1938, continued. Made camp at roadside in arroyo between steep cliffs of red rock. Set 44 mousetraps along sides of red-rock cliff. Shot a lizard (♀112) in wash and 3 Gambel's Quail (saved 2 crops). May 23, 1938. Caught in mousetraps only 1 Perognathus gold- mani (no emb.) (♂413; cheek-pouch contents saved) and 2 Peromyscus 2 emb. no emb. emerius (♀414, ♂415). Broke camp and drove toward Moctezuma (lost 4.8 miles by dropping bags when rear-door of truck sprung open) over rough, rocky, steep mt. roads from El Ojito: 12.6 miles to Rancheria (no water), 3.9 miles to El Salto (here we got water extremely polluted by cattle manure), 16.5 miles to: Tepachi, Sonora May 23, 1938, continued. Here stopped at almost dry mountain stream for 84.