Quast 1948 Tadarida mexicana 4 May 17 Trunfo, 1200 ft. Baja California Several were seen flying over camp at dusk last evening (?). May 24 Buena Vista, 25+ ft., 23°38'N, 109°41'W, Baja California. One female shot last night as it flew down the road. Specimen (#240) had one embryo, 8 mm long. This bat was shot at at late dusk as it flew down the roadway which was bordered by Iron- wood, Palo Verde, Cholla, Lumbai, Frutis, and other shrubs. Specimen was flying at about 6 feet off the ground and very fast. May 31 El Chono, 800+ ft., 2 mi W. Agua Caliente, Cape District, Baja Calif. One shot last night flying over pond at dawn at dusk. #287. Was feeding about 15 feet above the water level in company with Pipistrellus hesperus, Tadarida bemrosacca and Dasypetus ega. June 2 6 mi N. San Jose del Cabo, 250+ ft., Baja California Several shot last evening at dusk by Dr. Benam and Murray. June 12 La Laguna, 6200+ ft., Sierra de la Laguna, Baja California One shot last night at dusk by Dr. Beams. Shot one female this evening at about 7:30 as it was flying over center of flat north of camp. This species and Dasypetus ega seem to prefer the same habitat to feed, namely unobstructed flight terrain. This species feeding by flying more or less in a straight line th. Dasypetus in tight arcs and difficult maneuvers.