Zweifel Aug 23, 1950 We talked to Mr. Foreyth, a hoof and mouth disease men who is camped at Pina Blanca, and he gave us elaborate instructions for finding the spot where the Rana tarahumarae occurs. We found the canyon without too much trouble, and found the frogs. I then spotted the first two adults crouched together in a niche one reticulo rock well 3 1/2 feet above a pool about 2' deep and 8' wide. Other adults were found in the following situations: two in the bottom of a pool 3' deep and 12' wide; one on a rock shelf just covered by water beside a pool; one in the sandy shore of a pool; one in a hole in the conglomerate deep enough to hide the whole body and 2 feet above the waters. The canyon is quite narrow and rock walled. The pools in which the frogs occur are connected by underground flow, although there is surface flow where bedrock crops up and in a few other places. Cottonwoods, willows, oak and junipers are present in the canyon bottom. Tadpoles were common in most of the pools within the half mile or so of