N Slope Mt. Tacaguateque, 4600', Dept. Morazan, El Salvador Jan. 13, 1942. well away from the running water. Jan. 14, 1942. Picked up my trap line. Caught 8 Ceromyssus, 3 large Dryzomys, 1 small Dryzomys, and 1 Het- eromys. My first two traps had Ceromyssus in them. They were set at the base of a stone wall. The Heteromys was taken in a trap set on a sloping rock, with the narrow end of the trap actually in the stream. The small Dryzomys (10428) was taken on a flat muddy place by the water's edge. When I picked it up some & Oros- tacean was eating on the left ear, which was virtually gone. The large Dryzomys were all caught in sets on flat muddy places directly at the water's edge. Two Ceromyssus were caught in Rheomys sets directly in the running water. The treadles were unbaited and underwater, and the mice were cau- ght in the regular fashion, i.e. They had approa- ched the trap from the side and had not run down the dry part of the trap onto the treadle. The other Ceromyssus were caught in traps away from the stream- 1 at the base of a tree, the others in rocks. In the p.m. set 29 snares + 1 rat-trap. 14 snares wer set in the brush along a small stream west of camp, & the rat trap in the stream for Rheomys. The other snares were set in the brush directly,