Remarks.—Bailey (Proc. Biol. Soc. Washington, 11:120, May 13, 1897) referred 17 specimens from Loring to his newly named species, E. wrangeli [= Clethrionomys gapperi wrangeli] but based his description on specimens from Wrangell Island. He pointed out (loc. cit.) that all of the specimens from Loring had the "bellies strongly washed with buffy-ochraceous, while more than half of those from Wrangell have whitish bellies."
Specimens examined.—Total, 13, all in the Biological Surveys Collection, U. S. National Museum, from the following localities: Alaska: Revillagigedo Island: Loring, 10; mouth of Fish Creek, Ketchikan, 3.
Clethrionomys gapperi stikinensis, new subspecies
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.
Table 1. External and cranial measurements of Clethrionomys.