Quark 1948 Macrotus californicus 6 June 3 Losi Naran Jose del Cabo, 250+ ft. Baja California Failed to mention yesterday that the Macrotus californicus examined yesterday were perspiring. The bats had been flying about the cave, and with the outside heat, small beads of perspiration were seen on their noses and between their eyes. June 14 Mina Palmer del Medio, 400+ ft., 4 mi F.S.E. Pescadero, Baja California About fifteen obtained here this afternoon from an abandoned mine. The mine was composed of a single horizontal shaft and was about 75 yd. long, bending in an arc between openings on neighboring sides of a hill. The horizontal shaft broadened in its middle into a vertical stope and was braced with cross timbers and braced with planks in the ceiling. When first seen the Macrotus were about 30 feet from the opening, flying back into the mine as they were approached and finally out of the opposite end of the shaft to return to the original entrance behind us. The M. californicus were observed to make no noise when flying except the soft fluttering of their wings. When they returned to the first entrance after having flown out of the other end of the mine they hung within thirty feet of the opening and "peeled" back towards the opening and flying out finally, only a few individual daring to fly past us back into the mine. I happened