JESimpson, 1938. 59. Puerto Libertad, Sonora. April 26, 1938, continued. The wind was blowing too hard for the skifs of the fisherman; so we again missed a chance to see them catch the big ones and wet our new fish-hooks. Left the village for the rocky hill close by; made camp: 100 ft. 1 m. n. Puerto Libertad, Sonora. Set out 50 mousetraps on rocky hill of copal, granite among torote, palo verde, ocotillo, some creosote, saquero, and palo fierro; set out 50 live-traps in gravel-covered yellow soil near the granite hill among creosote, ocotillo, palo verde, torote, barablanca, and pitayo. April 27, 1938. Caught 1 Perognathus intermedius lithophilus Huey (o7249 x topotype), and 5 Peromyscus eremicus (3 juveniles and o7250; f 251) on the rocky hill; nothing taken in live-traps (Dr. Benson got one Perognathus baileyi in his live-traps). Señor M. Delgadillo found a mousetrap on his trap-line that was probably lost here by Huey of the San Diego Museum of Nat. History when he was here three years or more ago; this trap was besides a source of amusement a good clue that we had trapped at the exact type locality for the topotype of Huey's pocketmouse.