taken, I saw only one Mormoops, No. 12056, near the mouth of the tunnel. Back near the face of the tunnel we found many Chilonictis rubiginosa, a representative No. 12066 was taken. One half of a mile farther down the Bis Stes George D. Stirlon saw several of this species hanging under a shady clump of trees. Nos. 12067 and 12068 were shot by him. Clear day, 7 A.M.-72°F in shade, 12 N,-90°F in shade,- December 9, 1926- Most of the day was spent in camp. Toward evening we went over to the old furnaces in the ore plant where I found many Peroptryx canina last year. I found these little bats more abundantly in the partially lighted furnaces. By stretching a mosquito net over the door of one of the furnaces we caught 7139 bats. They all were one species, Peroptryx canina. Clear day, 7 A.M.-72°F. 12 N-90°F in shade, 12 N-101°F in sun.