Quast 1948 Journal 58 May 10 San Jose de Comondú, 700 ft, Baja California. Visited small caves about 3/4 mile SW of town last night hoping to obtain bats that would hang in them temporarily but obtained none although several were heard. Caught one Sacco (see species account + Catalog) last night on boulders beneath the caves. The caves were small and the openings large and high, making them probable night-hanging places for bats. Lost one live trap that was set by a trail last night (description of trap location under May 9). The 48 remaining traps caught 4♀ Peromyscus eremicus, none containing embryos. Shot bats last evening from 5:15 to when it was too dark to shoot (7:45). Pipistrellus hesperus were flying at 5:15 P.M. and Eptesicus fuscus appeared about 15 minutes later. Both were obtained by the group, and I obtained two of each. The bats were feeding among the tall palm trees of the arroyo, just west of town. May 11 Pozo Grande 25+ ft 25°46'N, 112°02'W Baja California Shot two Eptesicus fuscus flying over water hole about 200 yards west of town last night. Others of the group obtained Myotis yumanensis (see species account).