s respect _Tamias_
resembles most ground squirrels of the genus _Spermophilus_.

_Color pattern._--The chipmunks vary but little in color pattern, for,
even in _Eutamias dorsalis_, which is one of the most aberrant of the
chipmunks in color pattern, the pattern is characteristic of _Eutamias_.

The width of the longitudinal stripes is uniform in _Eutamias_ whereas
in _Tamias_ the dorsal, longitudinal light stripes are more than twice
as wide as the other stripes.

In _Eutamias_, only the two lateralmost dark stripes are short, whereas
in _Tamias_ all four of the lateral dark stripes are short; none extends
to the rump or to the shoulder.

The dark median stripe is present in both _Eutamias_ and _Tamias_ as
well as in other genera such as _Callosciurus_ and _Menetes_ (Ellerman
1940:390).

CHARACTERS IN WHICH THE SUBGENUS EUTAMIAS AND THE GENUS TAMIAS AGREE,
BUT DIFFER FROM THE SUBGENUS NEOTAMIAS

_Shape of the infraorbital foramen._--In the subgenus _Eutamias_ and
in the genus _Tamias_ the infraorbital foramen is rounded, whereas in
most species of the subgenus _Neotamias_ the foramen is slitlike. In
_Eutamias townsendii_, however, the infraorbital foramen is rounded
as much as in the subgenus _Eutamias_ and in the genus _Tamias_.

_Width of the postorbital process at base._--The postorbital process is
broader at the base in the subgenus _Eutamias_ and in the genus _Tamias_
than in most species of the subgenus _Neotamias_. In _E. townsendii_,
however, this process is relatively as broad as in the subgenus
_Eutamias_ and in the genus _Tamias_.

_Position of the supraorbital notch in relation to the posterior notch
of the zygomatic plate._--In the subgenus _Eutamias_ and in the genus
_Tamias_ the supraorbital notch is distinctly anterior to the posterior
notch of the zygomatic plate, whereas in the subgenus _Neotamias_, the
supraorbital notch is only slightly anterior to the posterior notch of
the zygomatic plate. This difference may be correlated with differences
in size, since specimens of the subgenus _Eutamias_ and the genus
_Tamias_ are larger than specimens of the subgenus _Neotamias_.

_Degree of convergence of the upper tooth-rows._--The rows of upper
cheek-teeth converge posteriorly in the subgenus _Eutamias_ and in
the genus _Tamias_, except that in some specimens of _E. sibiricus
asiaticus_ the rows of upper cheek-teeth are nearly parallel to each
other. In most species of the subgenus _Neotamias_ th