Quest 1948 Myotis yumanensis 3 May 11 Pozo Grande 25°46'N 112°02'W Baja California. About 30 seen last evening at water hole here. Bats were in a close group flying about 1 ft or less above the water in the vicinity of the pond bounded by willows and containing rocks protruding above the surface. The bats flew very close together for about 15 minutes (7:15-7:30 P.M.) occasionally touching each other with their wing tips. Specimens were obtained by Murray, Tevis, and Dr. Benson.