_Phenacomys intermedius_ Merriam, N. Amer. Fauna, 2:32, October 30, 1889. _Phenacomys intermedius intermedius_ Howell, N. Amer. Fauna, 48:15, October 12, 1926. _Type._--Obtained 20 miles north-northwest of Kamloops, 5,500 ft. elevation, British Columbia, by G. M. Dawson on October 2, 1888; type in United States National Museum. _Racial characters._--Size small; color of upper parts brownish gray; skull small. _Measurements._--A female from Pass Creek Pass, Pend Oreille County, measured: total length 127; length of tail 29; hind foot 17; weight 25 grams. _Distribution._--Known only from extreme northeastern Washington at Pass Creek Pass (W.W.D.) and the Blue Mountains. =Phenacomys intermedius oramontis= Rhoads _Phenacomys oramontis_ Rhoads, Amer. Nat., 29:941, October, 1895. _Phenacomys olympicus_ Elliot, Field Columb. Mus. Publ. 30, zoöl. ser., 1:225, February 1, 1899 (type from Happy Lake, 5,000 ft., Clallam County, Washington). _Microtus (Lagurus) pumilus_ Elliot, Field Columb. Mus. Publ. 30, zoöl. ser., 1:226, February 1, 1899 (type from Happy Lake, 5,000 ft., Clallam County, Washington). _Phenacomys intermedius olympicus_ Howell, N. Amer. Fauna, 48:21, October 12, 1926. _Phenacomys intermedius oramontis_ Anderson, Canadian Field Nat., 56:59, June 8, 1942. _Type._--Obtained on Church Mountain, 6,000 ft., Mt. Baker Range, British Columbia, just north of international boundary, by A. C. Brooks on August 6, 1895; type in Philadelphia Academy of Natural Sciences. _Racial characters._--Similar to _intermedius_ but darker, browner above and deeper gray beneath; skull large and heavy. _Measurements._--A female from Tye, King County, measures: total length 152; length of tail 40; hind foot 19; ear 12. A female from Tomyhoi Lake, Whatcom County, measures: 170; 45; 20; 15. _Distribution._--The Cascade and Olympic mountains, from Tomyhoi Lake (W. W. D.) on the north, to Mt. Adams (Taylor and Shaw, 1929:23) on the south. =Clethrionomys gapperi= (Vigors) Gapper red-backed mouse _Description._--Red-backed mice are heavy-bodied, short-tailed and short-legged mice, similar in general appearance to the meadow mice (_Microtus_). Unlike the meadow mice, they possess rooted molars, a primitive character. They do not have grooved incisors, like _Synaptomys_, or the great difference in the depth of the angles of the lower molars that characterizes both _Synaptomys_ and _Phenacomys_. Externally _Clethrionomys_ may be recognized by the broad red dorsal area from which they obtain their common name. Their sides are grayish or dusky and the undersides buffy white.