Quest 1948 Journal 149 June 30 San Luciano, 100+ ft, 5 mi S. Santa Rosalia, Baja California the larger Eptisicus fuscus over the cornfield. to be None of the bats seen were noticed drinking from the pond before darks. Dr. Benson obtained one Pipistrellus hesperus by netting it before darks and shot two of the Eptisicus fuscus that were flying over the cornfield. I obtained three of the latter over the cornfield. At dark we went back to the pond and tried to net some of the bats that were flying about and drinking there. A very audible sipping sound can be heard when they are picking up water. We were unsuccessful at netting any but saw about ten large bats (looked and sounded like Antrozous in flight) that were also circling and drinking at the pond. A half hour after darks the pond was filled from a stream of water and we abandoned the project. July 1 Same Location. Slept in the rocky arroyo bottom last night about # mile east of Las Crevitas. A very warm and humid night with large cumulus clouds over the gulf and lightning. Minimum temperature last night was 80 F. Investigated another mine just a few yards from where we slept and found it difficult to traverse, it having been flooded in the past. Did see bat droppings and purple splotches on the floor about 15 feet from the entrance, but no bats were seen. Returned to Santa Rosalia.