9/5/25 29 of a yellowish green color. This grass is found in patches; in many places the roots extend back to the cats claw (mimosa brush) which form a nearly impassable barrier along the lakes edge. Annual vines in many places have climbed over the cats claw and smothered it from the sunlight. Except for small trees or shrubs covered with vines and an occasional large tree the remainder of the patch is grown up with a heavy stemmed blue bladed grass which has been allowed to pile up year after year. In a muddy run which led from the water lillies into the cotton cat's claw I caught a rat (Sigmodon hispidus - ). I caught (10413) a blue-tailed rat in a trap at the edge of the sub-tropical jungle. The trap had been set along the base of a large boulder where I (10415) caught a spiny-pocket mouse two days before. Its stomach contained some whole seed and fruit pulp and green pulp. I caught another blue-tailed rat (10418) also in the jungles under a rock where the ridge south of our camp comes down and forms a rocky shore along the part of the lake. There was another jocote tree and I found many of the seeds carried back under the rocks. Its stomach contained a brown and