Quadrat 1948 Journal 147 June 30 Santa Rosalia, 10± ft, Baja California (Mina La Zonta). able to get close enough to net four of them in one swing of the net while they were still hanging and obtained 4 immature adults. In addition one Macrotus californicus was caught there. In this mine the curious red splotches seen on the rocks outside the cave at Mulege were seen again. They are just the right color to be the juice of the Cardon fruit which is ripe at this time. It is possible and probable that one of the two species in this mine carried it in. It was very hot outside and in the mine when it was investigated (about 3:00 PM). We were soaked in perspiration from the slight exertion of walking into the tunnel while bent over. Only one entrance existed to the mine and there was practically no air circulation. June 30 San Luciano, 100± ft, 5 mi S. Santa Rosalia, Baja California San Luciano is a small mining town 5 miles by road south of Santa Rosalia. It is built in the south-facing slope of a large hill and is of the same type and ownership as Santa Rosalia. It is surrounded by the same type of terrain as Santa Rosalia, ie soft sedimentary wave material flooded with the round boulders of alluvial mater- ial. The hills of this river-washed region consist mainly of small boulders embedded in soft silt matrix and support only sparse vegetation; only a few small bushes seem capable of growing in it.