Sept. 23 Tarata. Sept. 24 Left Tarata 8:15 for Aseguia camp (2 mi. N Tarata, 11,500 ft.), and spent the day setting up a 6 x 15 row grid with 15- meter spacing. It includes quite a bit of Aseguia and some long-abandoned terraces, but only about 30 meters of good mouse wall on the study area. Several Ziolaemus alticolor seen around camp and a few on the area. Most of the area is on top of the ridge (here about 400 m wide), but rows E and F are on the steep north-west facing slope. Evening calm, clear, no wind, moon 3 or 4 days old. Sat. Sept. 25 Minimin 31° F. Breeze came up during night, blowing down canyon from the east. Ran traps at 6 a.m.: 13 mice (including a mojaveer that escaped without tagging at 8:17. One set of foot? droppings contained bird feather, mouse hair, grass, a few large fragments of bone, cactus ? skin. Saw only 1 lizard all day, a S. alticolor, at 5 set under the cliffs off the Aseguia a half mile and started a core to see if humming butter entered; 6 or 8 flew up canyon and kept right going, many other birds also flew up canyon at dusk. Put about 10 large stamens south of camp to pick up home range of tagged individuals for line and wings. Ants put 38 M S and 4 stamens up the Aseguia in green grassy and then rocky. Drove up the hill in afternoon to get fed for cactus abrocana. First Polylepis at 12,000 ft., first appreciable Sapindophyllum quadrangulata at a pass at 12,600 ft. Sept. 26 Clear + calm until about 5 a.m., then breeze. Min: 27°, at 2 P.M. 65°, 5° under feet ground 20°C. Ants caught Plm. mojaveer, Phalaris, Absolon boliviensis