Murray 1948 Journal June 26 Calmelli, Baja Calif. A short distance beyond there was another horizontal shaft at the base of the hill. In it were a few Choeronycteris mexicana of which we were able to net 3. This mine was quite simple in form, with a shaft about 5 feet high most of the way. We continued on past Calmelli to the Arroyo San Luis. June 26 Arroyo San Luis, 800 ± ft., 9 mi W Calmelli. Turning into the Arroyo we could see a mine on the hillside across it. This proved to be a long shaft, branched at the end and with several small "nooks" cut at intervals. Most of the way in there was a large break in the roof with a blocked up wooden slide. There were a number of bats active in the mine, Choeronycteris mexicana, of which we took several. Also Quest found a Corynorhinus rafinesquii hung on the roof near the rear, and as we started back Dr. Benson found another in the same fashion; torpid, curled in a little ball, with ears folded back like a ram. Out near the entrance another was flying which I netted. The first two remained hanging even though we walked under them and caused considerable disturbance. Up the hill a little way was a large