W.B. Davis 1935 437 Cayman, Clark Co., Idaho, June 27. hundreds of cattle and horses, but since sheep had been allowed in the valley the carrying capacity of the range had diminished until now the only available forage during the summer was near the head of the valley on privately owned ranches. The creek is near the mountains to the east and these rise abruptly from the valley, presenting deeply eroded canyons and supporting very few trees save near the creek in sheltered areas. The Lemhi mountains are quite high here and at this writing still have some snow banks left. Pass Creek enters Birch Creek about a mile up stream). This afternoon, after I had put up the skins I got yesterday, I drove about 2 miles up stream and hunted for Citellus artemisiae, and Thomomys idahensis as this is the type locality for both these. I succeeded in locating the workings of gophers along a ditch bank, and also in an unused, dry, rocky portion of a field. I made nine sets - all my