Quast 1948 Eptesicus fuscus May 10 San Jose de Comondú, 700 ft. Baja California Two males (#161, 162) shot last evening just after dusk (7:30 P.M.) They were feeding around palm trees on the valley floor and appeared later than the Pipistrellus hesperus. Minimum temperature last night was 56° F. May 11 Perro Grande, 25+ ft 25°46' N 112°02' W. Baja California Two males shot flying over water-hole 200 yards west of town at late dusk. The bats were flying singly about 30 feet above the grain pond and surrounding sand, willow. They were easily recognized in flight by their higher level of flight and larger size than the Myotis yumanensis. I put up one specimen (#171), the other was found in the morning and put up by Dr. Benson. May 12 Triunfo, 1700 ft. Baja California Three caught by Dr. Benson, Tevis, Murray and myself, in an abandoned building in town yesterday afternoon. It is believed that the Eptesicus were hanging in a different place than the Tadarida mexicana and Myotis volans which were situated between doubled 2x12" supports to a box roof of a 2 story building. The Eptesicus were believed to have been in a crevice between a similar 2x12 sup- port and the wall, one story lower. Specimens were put up by Tevis.