Murray 1948 Leptonycteris May 4 1/2 mi S Mulege, 100+ ft., Baja California Dr. Benson caught about 4 in the inner part of a cave on the hillside. There were two main chambers separated by a narrow opening. A deep layer of guano and dust was on the floor. Also caught were Mormoops megalophylla and Macrotus californicus. May 20 1 mi E San Antonio, Baja California Looked into a mine up on the hillside, having an entering passage with two small branches and then a long almost vertical shaft. We trapped some in the side passages and then Dr. Benson descended and drove more up which we also trapped. He found another entrance at road level. There were hundreds of bats in the lower shaft and we could hear a roar of wing beats. Most were Macrotus californicus but we took 20 Leptonycteris divided among us. May 22 Cerro Agua Amarga, 4 mi SE Buena Vista 23°36'N, 109°37'W Visited a cave on this rocky hill, washed out of the sandstone and of fair size. There were about 300 Macrotus californicus in it and one lone Leptonycteris. We screened the bats through a net to be sure of their identity. There was a layer of guano on the floor.