Hendry Creek, 9,100ft., 1/2 mi. E of Marian, White Pine Co., Colorado Lee Arnold 1937 June 25, be picked up from the water. A third distinct habitat is the aspen groves of the flats and lower hillsides. These seem to have little mammal life save for Peromyscus which seem to know no particular habitat in this region. These groves are frequent by browsing and resting Odocoileus hemionus and on one occasion I saw a Grouse with five small chicks foraging beneath the aspens. It is true that aspens, although not thick are scattered among the meadows and sagebrush flats of the lowlands. The fourth typical habitat consists of the mixed pine and fir forests of the side hills and upper canyons where they have not been logged. Although I have not trapped this area I have collected Callospermophilus and Eutamias quadrivittatus in it. Higher up on the hillsides this habitat gives way to one composed primarily of limber pine and fir. The only mammal I have seen in this region is Callospermophilus. I have this region-- that is on the top of Mt. Marion is only too sparse ground clinging