Murray 1948 Journal May 3 Mulege, 25 ft., Baja California with narrow deep walled Y shaped origination. There is palo verde and palo blanca, lumbou, cholla, and other thorny brushes. The cliffs seem to be bare volcanic rock, some of it conglomerate, while parts of the wash bottom are soft sand. The traps were partly on the slopes, and in both rocky and sandy wash. At dusk a great swarm of Pipistrellus poured down the canyon, of which Dr. Benson shot 5. Many of them were around the stream later when we reached it. We heard that the bat cave is in the next canyon. May 4 Same location The 50 traps caught exactly nothing. All but a few had the bait stolen, probably by ants. Two were snapped and disrupted! Saw a vermilion flycatcher. Packed up to leave but first went up to the cave we had heard so much about with the guidance of a soldier. Found the mouth small, leading into a rounded out cavern about 50x30 feet; and 5 ft. high near the front tapering down to almost nothing at the rear. The floor was covered with a deep layer of fine powdery dust.