M. Toford 1951 Otomys opimus ? April 28 Zirine, 21 mi. NE Tarata, 15300', Dept. Tacna, Peru Mounds were numerous here in sandy areas with bunches of grass. Most of the holes were closed most of the time. We heard no sounds from these tuco and saw some out on the surface. I opened one hole and set a Schayler trap in the entrance. The next morning the hole April 29 was plugged but the trap was not sprung. I opened 9 more holes in the same group of mounds – an area about 100 ft. in diameter – and set 10 Macabee traps well down in the holes. By noon 3 of the holes had been plugged, springing only one of the traps and catching nothing. April 30 In the morning all the holes were still open and no traps sprung. I left the traps in and plugged the holes. By mid-afternoon nothing was caught. May 1 In the morning one trap held a ?, possibly immature, by the tail. It had apparently backed into the trap. When found, it was at the surface, frozen stiff, in a new hole about