_Type._--Male, adult, skin and skull, No. 30735, Museum of
Vertebrate Zoology, University of California; from Stikine River at
Great Glacier, British Columbia; obtained on August 13, 1919, by J.
Dixon; original number 7691.
_Range._--Known only from the lower Stikine River Valley of British
Columbia and the Cleveland Peninsula of Alaska.
_Diagnosis._--A medium-sized, dark-colored member of the _gapperi_
group. Dorsal stripe wide, near Auburn with mixture of black-tipped
hairs; sides and venter washed with Ochraceous-Tawny. Skull small;
cheek-teeth narrow; auditory bullae relatively uninflated.
_Comparisons._--From topotypes of _Clethrionomys gapperi wrangeli_,
_C. g. stikinensis_ differs as follows: dorsal stripe slightly
wider and brighter; sides slightly duller (lacking the olivaceous
wash of _C. g. wrangeli_); all cranial measurements taken averaging
smaller except height of skull, which is approximately the same;
alveolar length of upper tooth-row and length of incisive foramina
notably shorter; auditory bullae less inflated; cheek-teeth much
narrower.
From topotypes of _C. g. phaeus_, _C. g. stikinensis_ differs as
follows: dorsal stripe and sides darker; auditory bullae less
inflated; cheek-teeth narrower; skull smaller in most measurements
taken (see table 1).
From topotypes of _C. g. solus_, _C. g. stikinensis_ differs as
follows: dorsal stripe lighter (more tawny underwash); ventral wash
of buffy much paler (especially noticeable around mouth and on
throat); zygomatic and lambdoidal breadths greater; skull deeper;
auditory bullae more inflated; cheek-teeth slightly heavier.