W.B. Davis 1935. 426 Kayman, Clark Co., Idaho. June 27. river at Blackfoot and since) they are apparently limited to areas of moisture, they could hardly have moved across the desert to Arco but must have come from the mountains. I believe this squirrel has reached there by migration thru the Bitterroot Mountains and thus into the Big Lost River Mts. and thence down the river to Arco. I talked with the local "squirrel" man and he informed me that C. arnott extended its range up the valley as far as Mackay and perhaps farther). From there on north, C. columbianus was the dominant squirrel. I asked him about C. mollis and was told there were none to be found in the country. I spent the greater part of the afternoon in driving about looking for C. mollis and found a small colony along the railroad tracks about 31 mi. SE of Arco. They, again, were in that loose type of soil. I succeeded in taking five, only one of which was an adult.