na. | long and | broad and | broad and
| pointed. | rounded. | rounded.
------------------------------------------------------------------------

These differences of _Neotamias_ are so slight in comparison with the
similarities (ten features mentioned above) that _Neotamias_ here is
accorded only subgeneric rank under the genus _Eutamias_, instead of
generic rank.

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 cu