lambdoidal
breadths are greater, nasals slightly shorter, auditory bullae
slightly more inflated, teeth larger, and braincase larger.

As compared with topotypes of _C. g. limitis_, _C. g. gauti_ is
darker, has a greater zygomatic breadth, longer upper tooth-row,
longer nasals, and narrower rostrum.

_Measurements._--External and cranial measurements of the type, and
the average and extreme measurements of four adult males and one adult
female from the type locality (including the type) and five miles
south of the type locality are: Total length, 144, 147 (140-152);
tail, 40, 42 (39-45); hind foot, 20, 19.3 (19-20); condylobasilar
length, 22.3, 22.9 (22.2-24.0); zygomatic breadth, 13.6, 13.7
(13.5-14.0); lambdoidal breadth, 11.9, 11.7 (11.4-12.0); alveolar
length of upper cheek-teeth, 5.1, 5.2 (5.1-5.4); interorbital breadth,
4.0, 3.9 (3.8-4.0); length of nasals, 7.0, 7.2 (7.0-7.6); breadth of
rostrum, 2.9, 3.1 (2.9-3.4); length of incisive foramina, 4.8, 5.1
(4.8-5.3).

_Remarks._--Two specimens from a locality 21 mi. W and 3 mi. N
Saguache, Saguache County, Colorado, although referred to this
subspecies on the basis of paler pelage, inflation of auditory bullae,
and heavier teeth, show characters of _C. g. galei_ in the narrowness
across the zygomata and lambdoidal crest. Four specimens from
Silverton (1 adult and 3 young adults) are referable to this
subspecies on the basis of color of pelage and cranial proportions but
are smaller than either _C. g. gauti_ or _C. g. galei_.

The specimen from Pecos Baldy, Pecos Mountain, San Miguel County, New
Mexico, referred by Bailey (N. Amer. Fauna, 52:192) to _Clethrionomys
gapperi galei_, is here referred to _C. g. gauti_ on geographical
grounds.

The name _gauti_ is proposed in honor of the collector of the type
specimen, James H. Gaut.

_Specimens examined._--Total, 14, distributed as follows and, unless
otherwise stated, in the Biological Surveys Collection:

+Colorado+: _Saguache County_: 21 mi. W and 3 mi. N Saguache, N 38 deg.,
106 deg. 31', 9100 ft., 2 (Univ. Kansas Mus. Nat. Hist.). _San Juan Co._:
Silverton, 4.

+New Mexico+: _Taos County_: Twining, 10,700 ft., 3; 5 mi. S Twining,
11,400 ft., 3. _Sandoval County_: Goat Peak, Jemez Mountains, 1.
_Colfax County_: 15 mi. SW Cimarron, 9000 ft., 1 (Amer. Mus. Nat.
Hist.).

_Additional records._--+New Mexico+: _San Miguel Co._: Pecos Baldy,
Pecos Mountain, 1 (Bailey, N. Amer. Fauna, 52:192, 1932).

+Cl