_Sorex longicauda prevostensis_ Osgood, N. Amer. Fauna, 21:35, September 26, 1901.
_Sorex obscurus prevostensis_, Elliott, Field Columb. Mus. Publ. 105, zool. ser. 6:450, 1905.
_Type._--Adult male, skin and skull; No. 100618, U. S. Biol. Surv. Coll.; obtained on July 3, 1900, by W. H. Osgood from north end of Prevost Island (Kunghit Island on some maps) on coast of Houston Stewart Channel, Queen Charlotte Islands, British Columbia.
_Range._--Known only from the type locality.
_Diagnosis._--Size medium; measurements of two specimens from the type locality are: total length, 132, 142; tail, 53, 59; hind foot, 14, 15. Color dark.
_Comparisons._--Larger and darker than _S. v. elassodon_. Resembles _S. v. longicauda_ but darker, tail relatively somewhat shorter on the average and rostrum relatively slightly broader.
_Specimens examined._--Total number, 14. BRITISH COLUMBIA: Prevost Island, Queen Charlotte Group, 14 BS.
_Sorex obscurus alascensis_ Merriam, N. Amer. Fauna, 10:76, December 31, 1895.
_Sorex glacialis_ Merriam, Proc. Washington Acad. Sci., 2:16, March 14, 1900, type from Point Gustavus, east side of entrance to Glacier Bay, Alaska.
_S[orex]. alascensis_, Merriam, Proc. Washington Acad. Sci., 2:18, March 14, 1900.
_[Sorex glacialis] alascensis_, Elliott, Field Columb. Mus. Publ. 45, zool. ser. 2:372, 1901.
_Sorex alascensis alascensis_, Miller, U. S. Nat. Mus. Bull., 79:16, December 31, 1912.
_Type._--Adult female, skin and skull; No. 73539, U. S. Biol. Surv. Coll.; obtained on July 10, 1895, by C. P. Streator from Yakutat, Alaska.
_Range._--The coast of southern Alaska from the vicinity of Juneau west to include eastern part of the Kenai Peninsula.
_Diagnosis._--Size medium for the species; average and extreme measurements of 9 specimens from 9 mi. W and 4 mi. N of Haines, Alaska, are: total length, 110 (104-128); tail, 45.4 (41-52); hind foot, 14 (14-14). Color grayish brown.
_Comparisons._--For comparison with _S. v. longicauda_ and _S. v. elassodon_ see accounts of those subspecies. Resembles _S. v. obscurus_ in color but differs in larger skull, longer hind foot and in somewhat darker color. Larger and darker than _S. v. shumaginensis_; the two intergrade near the base of the Kenai Peninsula.