ctions of mammals that we have consulted in order to
satisfy ourselves concerning the subspecific status of specimens from
many localities.

~Marmota flaviventer luteola~ A. H. Howell

A. H. Howell (N. Amer. Fauna, 37:50, April 7, 1915) referred specimens
from Bridgers Pass, Wyoming, to _Marmota flaviventer dacota_, on the
basis of paler underparts because, according to the data of Howell (_op.
cit._), _M. f. dacota_ and _M. f. luteola_, the contiguous subspecies,
do not differ significantly in other ways. Casual comparison reveals to
us no additional differences between the two. We have examined the three
specimens available to Howell from Bridgers Pass (Nos. 18733/25527,
18734/25528, and 18735/25529 U. S. Biol. Surv. Coll.) and find the tone
of the underparts to be darker (more nearly russet) than in typical
_luteola_. The tone, however, varies considerably, both individually and
geographically, in _luteola_ and it is possible to match almost exactly
the ventral coloration of the specimens from Bridgers Pass with that of
specimens from within the geographic range of _luteola_; Nos. 160509,
from Bear Creek, 8 miles west of Eagle Peak, Wyoming, 18875 and
18731/25535, from the Laramie Mts., Wyoming, and No. 203744 from Sulphur
Springs, Grand County, Colorado, all in the United States Biological
Surveys Collection, are examples to the point. Being influenced by the
geography of the region, we therefore consider the three specimens from
Bridgers Pass best referred to the subspecies _Marmota flaviventer
luteola_.

~Spermophilus variegatus grammurus~ (Say)

A. H. Howell (N. Amer. Fauna, 56:147, May 18, 1938) accorded _Citellus_
[= _Spermophilus_] _variegatus utah_ Merriam a geographic range that
included the Kaibab Plateau of Arizona. Durrant (Univ. Kansas Publ. Mus.
Nat. Hist., 6:119, August 10, 1952) assigned to _S. v. grammurus_ a
geographic range that included southern Utah from the eastern to the
western border but in doing this did not mention the rock squirrel of
the Kaibab Plateau of Arizona that also might be expected to be
referable to _S. v. grammurus_. Howell (_loc. cit._) had two specimens
from the Kaibab Plateau. Of these we have examined the one from Big
Spring (161566 BS) and find that it lacks the darker (more tawny) head
and posterior back of _C. v. utah_ and agrees with _C. v. grammurus_. On
this basis we refer the rock squirrel of the Kaibab Plateau to the
subspecies _Spermophilus variegatus gramm