Murray 1948 Macrotes californicus May 27 El Carrizalito, 1400 ft, 5 mi N Santiago, Baja Calif. We are staying here in a large brick building originally intended for a tuberculosis sanitarium but incomplete. The walls are plastered and it lacks mainly doors and windows. In one of the small downstairs rooms each night we have found several Macrotes hanging but always touchy and ready to fly. This is the only room in which they have hung up, with just a few flying upstairs. The first night Dr. Benson marked about 5. Subsequently I have been caught and just 1 was marked. One bore its young during the night while in captive but the baby was dead when we found it. One was caught in the evening over the pool behind the caretakers house. However none were taken in either of two concrete tanks which we hunted over each night. May 31 Santa Anita, 250 ± ft., (Cape District) Baja Calif. Found one hanging in a room of an empty and closed building. Elsewhere there were some Myotis velifer June 6 mi N San Jose del Cabo, 250 ± ft., Baja Calif. Looked at a cave in the base of a sandstone hillside. It was about 30 feet deep and very narrow - contained about 30 bats.