Quest 1948 Myotis californicus 7 May 5 Bahia Concepcion 13 mi S.E. Mulege Baja California One shot by Dr. Benson last evening at dusk. Bat was feeding over cliffs bordering beach where we were camped. May 13 Santa Ana, Arroyo de Los Viejos, 25 ft, 24°03'N, 110°58'W Baja Cal. Two females and five males obtained by group around fresh-water pond in arroyo below house at Santa Ana. Bats were flying about pond, coral, palm and "Mangle Dulce" trees at late dusk. I shot one male (#172). His epididimis glands were located in the scrotatum and swollen. The females done by Twiss were said to contain no embryos. Minimum last night was 51° F. May 23 Buena Vista, 25 ft, 23°35'N, 109°41'W, Baja California One male and one female caught by land net in house nearly our camp last night (#236, 237). The female had one embryo of 10 mm. This species was seen last night and the night previously flying very close to the house and in and out its low porch and open doors at dusk. The two specimens cought last night were netted in the large central room of the house. Several people have lived in the houses for years although all were outside while the bats were flying. I would estimate that there were about 10 individual in that particular group of bats. May 27 El Carripalito, 1400 ft 5 mi N. San Diego Baja California One female (#264) shot last evening at sun-