Murray 1948 Mormoops megalophylla May 4 Mulegé, (¼ mi S), 400± ft., Baja Calif. Looked into a cave up on the hillside. This had a small mouth but a chamber which broadened out into about 50×30 feet and then narrowed to a very small hole in the rear. There was a deep powdery layer of dust and guano. Dr. Benson went into the rear chamber and chased out a number of bats, of which I caught 2 Mormoops. There were also many Macrotus californicus and a few Leptonycteris.