Quest 1948 Journal 87 May 26 El Carriyalito, 1400 ft, 5 mi N. Santiago, Baja Calif. The Natalis mexicanus were seen only in the potholes in the beginning and also were stirred from their hiding places with difficulty. After they were frightened out of the potholes, one group by poking them with a bamboo stick, the Natalis flew to the roof of the second room where they hung in groups of about eight. About ten Macrotus californicus were in the roof of room #1 and flew in - immediately when illuminated by the flashlight. There were noticeably fewer bats this time than when the cave was visited previously. Numerous cockroaches were seen near the Myotis groups. There were many mud-wasp nests on the cave walls and the nest of one Black Phoebe about 25 feet from the entrance and ten feet off the ground. Of the numerous potholes, the Natalis mexicanus (with a few Myotis velifer) gathered in the most protected and extensive ones. The second cave visited was a little over 100 yards south of the first one and also called the second cave in the previous description yesterday. Dr. Benson estimated its length as 250 feet with its entrance 80 feet high and wide. It was in three sections; one, the wide mouth about 80' long; two a center, smaller section also about 80'