Murray 1947 2 Macrotus californicus (cont.) May 10 San Jose de Comondú, 700±ft., Baja California It was in one of the two narrow branches of the cave, having a high crack extending still farther back. There was a great deal of guano on the floor. At least one other bat was the same kind, though there were only about 6, and 1 Leptonycteris was caught by Tevis. (See journal) May 20 San Antonio, Baja Calif. Went into a long horizontal mine shaft in which there were several bats, apparently all Macrotus. We netted 3, then discovered the way blocked and the bats gone beyond. May 20 1 mi E San Antonio Found another mine on a steep hillside which contained hundreds of bats, the number we couldn't estimate. We trapped some in two short upper passages, then Dr. Benson went down a long, very steep shaft and drove a lot of them upward into one of the small tunnels. From above we could hear a roar of wing beats which became louder as he drove them up. All were Macrotus except a few Leptonycteris. They were very active and some were even flying near the entrance when we arrived.