Quart 1948 Journal 135 June 24 1/4 mi South of Mulege, 50' ft, Baja California Shot bats last night by the palm tree at the border of the pond above the mission. They appeared about 7:20, the first being seen were small bats (probably Pipistrellus hesperus) flying very high and from the hills. Nighthawks appeared at the same time soon to be joined by the larger bats, Eptesicus fuscus and dasypterus ega. The small and large bats and Nighthawks formed a large cloud over our heads and Pipistrellus hesperus, Dasypterus ega, and Eptesicus fuscus were shot by Tavis and Dr. Benson. Just before dark the cloud of bats disappeared leaving the Epterus and Dasystemus to feed singly among and along the palm border. I netted one Eptesicus fuscus at 8:30 last night out of many that were flying along the edge of palm olive trees and over the trail near camp. Visited the large bat cave about 500 yards from here in the side of the mountain this morning. Found the number of bats much fewer than at the time of our previous visit. We found about 50 Macrotes californicus in the second room of the cave and obtained one Leptonycteris and one A.... Momopops megalophylla. Another cave said to be nearby was not investigated.