The study area at 10 kms Tarata, 10,001 ft, is about as low as seems profitable to study; any lower is too barren. It consists of two habitats: dry wash (3/4 station) and upland (6 5 stations). The rocky river bottom contains tobacco, broad-leaved shrub, some other bushes, a few cacti, and a few scattered plants such as tomatoes, One patch of wolfe (no fruits). The upland was columnar cactus (yellow flowers), crumble-leaves bush, berberis-leaved thorn scrub, and a few other bushes, plus lesser herbs such as capsulated animals, breaks-off weed, the radchik succulent from the tillarde's desert, dwarf Tillardia, and, especially on the upper rows, a few tufts of grass, cello Hobernal joint cactus (orange flowers), [illegible]. Two departures from "natural" are a stone retaining wall below the road near one corner of the grid, and the presence of a distinct network of grazing tracks on the hillside. Another complication is the water hole a half-kilometer downriver. The location is at about km 62 from Tacna. The tobacco, broad-leaved shrub, and tomato look vigorous, but the cacti, in spite of blooms, look in sad shape and the crumbly-leaved plant practically dead (except in a few spots where it may have received water). The red-flowered mistletoe looked healthy. Returned to Tarata in PM. Sept 21 Tarata Sept 22 Tarata. Lots of hummer activity around the big red-flowered bush at the big rocks south of town at dusk 3 o'clock. Too many Bibitzers to set traps.