_Measurements._--Ten males from the Cascade Mountains average: total length 305; length of tail 110.9; hind foot 46.5; ear 17 (dry). The weights of 3 males and 5 females average, respectively: 281 grams; 259.4 grams. _Distribution._--The higher and eastern Cascade Mountains from Barron (Howell, 1938: 213) and Bauerman Ridge (Howell, 1938: 213) south to Cleveland (Howell, 1938: 213) and Goldendale (W. W. D.). _Remarks._--The golden-mantled ground squirrel of the Cascades is similar to _Citellus lateralis_ but is larger and duller-colored. Head and body are about 8 inches in length and the tail is about 4-1/2 inches long. The upper parts are brownish gray with one pale and two dark stripes on each side. Head and shoulders are tawny. The underparts are dull buffy gray. _Citellus saturatus_ occupies the Cascade Mountains of Washington and southern British Columbia. It inhabits talus slides and clearings. The rock embankment of the Great Northern Railroad between the Cascade Tunnel and Leavenworth, Chelan County, is a favored habitat and the population along the railroad probably averages one squirrel each hundred yards. To the east it extends well into the Transition Life-zone, being abundant in clearings in the open forest of yellow pine. In places its range nearly reaches the Upper Sonoran Life-zone. A few miles east of Leavenworth, Chelan County, we found this squirrel in chapparal and brush, principally composed of _Ceanothus creneatus_. Here the animals were unusually abundant and formed a colony almost as dense as colonies of _Citellus washingtoni_. Entrances of burrows are usually placed beside rocks, stumps or logs. In the area near Leavenworth, mentioned above, entrances to burrows were in the open or among roots of bushes. The entrances to many burrows are doubtless concealed under talus slides. No complete records of excavations of burrows are available. One burrow, uncovered by road construction operations three miles east of Scenic, Chelan County, was dug in the earth-filled cleft of a great granite boulder. The cleft was 5 feet wide at the surface of the ground but narrowed until at a depth of six feet the stones were in contact. The cleft was at least 10 yards long. The burrow descended at an angle of 45 degrees, to a depth of three feet. Here the construction work had passed the cleft, but digging into the almost vertical wall uncovered the nest at the end of a horizontal tunnel two feet farther on. It was a matted cup of dry grass with two fresh, green fern fronds lying loose in the cup. Two divergent burrows emerged on opposite sides of the nest cavity, but a fall of the loose, gravelly soil prevented further observation. The body of the occupant, crushed and mangled by the steam-shovel scoop, was that of a small male.