July 9 (cont.) Papa Bern Tree, 150+ ft., Dept. Lima, Peru Carl and I set a line of 28 small Shermans up the top half of a rocky cactus hill 4 mi. ENE Puerama (locality of our first night's trapping line). We saw 2 bats flying around and heard what sounded like the high whistle or screech of a bawth. Pearson, Ray, & I took chromesomes of the 3 Calamp caught this morning. July 10 6:30 am. We picked up the traps we set an found a Phyllotis aurivius in a trap near the top of the slope in rocks and cactus. Previously we had found P. darwini on the lower slopes. This morning we set out a grid on the study area. We put out 144 stakes, 50 feet apart in an area 600 ft x 600 ft. to include a hill and a slightly level part adjacent to it. The Jellaursea is fairly thick and old line. We will set about 72 traps (ultimate trap posts) for 4 nights to get some idea of home ranges. 4:30 pm. Pearson & Ray set the small Shermans at 1/2 the posts in the grid. I checked an adjacent slope for mouse sign and found tracks in the soft sand. I get the idea that the mice avoid going on the Jellaursea mats because the track seem to go around them. I found both large & small tracks, and I'd