_Type._--Male, adult, skin and skull, No. 74939, Biological Surveys
Collection, United States National Museum; from Loring,
Revillagigedo Island, Alaska; obtained on September 22, 1895, by C.
P. Streator; original No. 4980.
_Range._--Known only from two localities on Revillagigedo Island,
Alaska.
_Diagnosis._--A short-tailed, dark-colored member of the _gapperi_
group. Dorsal stripe wide, between Chestnut and Bay (capitalized
color terms after Ridgway: Color Standards and Color Nomenclature.
Washington, D. C., 1912), with slight mixture of black-tipped
hairs; sides and venter heavily washed with Ochraceous-Tawny. Skull
flattened; rostrum proportionately short and wide; auditory bullae
relatively uninflated.
_Comparisons._--From topotypes of _Clethrionomys 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.