Howell's (1929) arrangement of the genera and subgenera of chipmunks is judged to be correct as indicated by the following arrangement that I propose. GENERA AND SUBGENERA Genus #Eutamias# Trouessart _Eutamias_ Trouessart, E. L. Catal. Mamm. viv. et foss., Rodentia, in Bull. Soc. d'Etudes Sci. d'Angers, 10:86-87, 1880. Type _Sciurus striatus asiaticus_ Gmelin. _Eutamias_, Merriam, C. H., Proc. Biol. Soc. Washington, 11:189-190, July 1, 1897. _Eutamias_, Howell, A. H., N. Amer. Fauna, 52:26, November 30, 1929. _Tamias_, Ellerman, J. R., The families and genera of living rodents. British Mus. (Nat. Hist.), 1:426, June 8, 1940. _Tamias_, Bryant, M. D., Amer. Midland Nat., 33:732, March 1945. _Diagnosis._--Skull lightly built, narrow; postorbital process light and weak; lacrimal not elongated; infraorbital foramen lacks canal, relatively larger than in most sciurids; P3 present; head of malleus not elongated; plane of manubrium of malleus 90 degrees to plane of lamina; hypohyal and ceratohyal bones of hyoid apparatus fused in adults; conjoining tendon between anterior and posterior sets of digastric muscles ribbonlike; keel on dorsal side of tip of baculum; tail more than 40 per cent of total length; five longitudinal dark stripes evenly spaced and subequal in width; two lateral dark stripes short. Subgenus #Eutamias# Trouessart _Eutamias_ Trouessart, E. L. Catal. Mamm. viv. et foss., Rodentia, in Bull. Soc. d'Etudes Sci. d'Angers 10:86-87, 1880. Type _Sciurus striatus asiaticus_ Gmelin. _Eutamias_, Howell, A. H., N. Amer. Fauna, 52:26, November 30, 1929. _Eutamias_, Ellerman, J. R., The families and genera of living rodents. British Mus. (Nat. Hist.), 1:426, June 8, 1940. _Eutamias_, Bryant, M. D., Amer. Midland Nat. 33:732, March 1945. _Diagnosis._--Size large; lambdoidal crest moderately developed; supraorbital notches distinctly anterior to posterior notch of zygomatic plate; baculum with faint keel on dorsal surface of tip which curves upward; pelage coarse; ears broad, rounded, of medium height. _Geographic range._--Palearctic. West to Dvina and Kama rivers, Vologda, and Kazan, in European Russia. South to southern Ural Mountains, Altai Mountains; Kansu, Szechwan, Shensi, Shansi, and Chihli provinces of China; Manchuria and Korea. East to Hokkaido Island, Japan; Kunashiri Island, southern Kurile Islands; Sakhalin Island, and Yakutsk, Siberia. North nearly to Arctic Coast in Siberia and European Russia (Ellerman and Morrison-Scott 1951:503). Subgenus #Neotamias# Howell _Neotamias_ Howell, A. H., N. Amer. Fauna, 52:26, November 30, 1929. Type, _Eutamias merriami_ J. A. Allen [=_Tamias asiaticus merriami_ J. A. Allen]. _Neotamias_, Ellerman, J. R., The families and genera of living rodents. British Mus. (Nat. Hist.), 1:426, June 8, 1940. _Neotamias_, Bryant, M. D., Amer. Midland Nat., 33:372, March, 1945.