Eutamias amoenus felix [Howell], Jour. Mamm., 3:184, August 4, 1922.
Tamias amoenus felix [Ellerman], Fam. and Genera of Living Rodents, British Mus. Nat. Hist., p. 432, June 8, 1940.
Fig. 81. Distribution of the yellow-pine chipmunk in Washington. A. Tamias amoenus luteiventris. B. Tamias amoenus canicaudus. C. Tamias amoenus affinis. D. Tamias amoenus ludibundus. E. Tamias amoenus felix. F. Tamias amoenus caurinus.
Type.—Obtained at Church Mountain, British Columbia, near the United States boundary by Allan Brooks on August 13, 1895; type in Philadelphia Academy of Natural Sciences.
Racial characters.—Large size and rich, dark color.
Measurements.—Ten topotypes average: total length 224.7; length of tail 98.8; hind foot 34.1; ear 14.4.
Distribution.—The extreme northwestern Cascades, north and west of Mt. Baker.