thrionomys gapperi wrangeli_,
_C. g. solus_ differs as follows: dorsal stripe wider and slightly
brighter; sides brighter; venter more heavily washed with
Ochraceous-Tawny (heavy wash in all 13 _C. g. solus_ examined; in
_C. g. wrangeli_ no wash in 11, slight wash in 16, and heavy wash
in only one); nasals, alveolar extent of upper cheek-teeth and
incisive foramina shorter; skull shallower when measured with
tympanic bullae included; rostrum averages slightly broader.

From _C. g. phaeus_ of the adjacent mainland, _C. g. solus_ differs
in: dorsal stripe slightly darker; ventral wash more prominent;
tail shorter; skull smaller in all parts measured except that
nasals are approximately the same length, auditory bullae notably
smaller and teeth notably narrower.

_Measurements._--External and cranial measurements of adults are
shown in table 1.

_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