Puerto del Triunfo, Dept, Usulutan Dec., 28, 1925 - Jan., 25, 1926 Sharp-tailed mouse- Only four specimens of the sharp-tailed mice were taken by me at Puerto del Triunfo. Nos. 10950 and 10975 captured in vines leading down from the top of a tree at the edge of heavy dense jungle. The trap was set about four feet from the ground. Under the vines was a small jungle stream. In these vines I caught a Pigmy opossum and other Oryzomys. No. 10971 was trapped on the ground in a dense growth of lily like plants not far from a swamp. This place showed evidences of being very muggy during the rainy season. No. 11010 was caught under a log in catsclaw brush at the west end of the heavy grass pasture northwest of the village. The ants destroyed that skin so I saved the skeleton only. Food habits seem to be the same as with other Oryzomys seeds and plant fibers.