Murray 1948 2 Pipistrellus hesperus May 17 Jimeno, 1700 ft., Baja California Fly early before dusk, and ceasing before dark. Shot 2 (see journal) May 19 Same location By now the pipistrelles have disappeared although larger bats seem about as common May 28 El Carrizalito, 1400 ft., 5 mi N Santiago, Baja Calif. Have found them quite common here. Each night, stationed at a concrete water tank have netted several. They start flying at about 6:30, high at first and then lower to feed. Many come over the pool but only part to drink. They cease to appear at about 8:00. (see journal May 24-28) May 29 El Chorro, 800 ft., 2 mi W Agua Caliente (Cape District) Many flying at dusk here. Shot 18 (see journal) June 7 La Teraya, 5 mi SE Punta Gasparina (cap dist.) Baja Calif. Several flying in the canyon here, mostly over the mesquites and other bushes and not far from a small pool at which we were hunting bats. Shot 28. June 11 La Laguna, 6200 ft., Sierra de la Laguna, Baja Calif. A little scarce here, as are all bats. They start flying fairly late and feed over the bare laguna. Shot 18. July 14 Catauiña, 1850 ft., Baja Calif. Many flew at dusk, yet not many came to water. Shot 47