Mt. Cacaguateque, Dept., San Miguel, Salvador Nov., 21, 1925 - Dec., 23, 1925 Sub-Tropical Peromyscus This species was the most common one found in the locality. Their range was confined strictly to the sub-tropical zone where it extended up the canyons usually in association with coffee. There were no obvious signs of this form but traps placed under rocks, in brush, in banana groves and even in the water of the small mountain streams, were sure to catch Sub-Tropical Peromyscus if left there long enough. One trap which was set about thirty-five feet inside of the Sonoran zone caught one of these mice, but acids from this one specimen I found the Sonoran zone to be as firm as a stone wall against them. From the stomach contents examined by me, I found the sub-tropical Peromyscus to be omnivorous. Their food ranged from insects to green plant pulp. Although primarily terrestrial in habits I caught one on a fallen dead tree about five feet from the ground and at night I saw one running along a horizontal limb in the dense brush.