_Type._--Adult male, skin and skull; No. 177719, U. S. Biol. Surv. Coll.; obtained on May 21, 1911, by Alexander Wetmore from mouth of Millstone Creek, Nanaimo, Vancouver Island, British Columbia. _Range._--Vancouver Island. _Diagnosis._--Size medium; measurements of two from the type locality are: total length, 113, 118; tail, 48, 49; hind foot, 14, 14. Dark in summer and winter, underparts brownish. _Comparisons._--Smaller than _S. v. setosus_ but color much the same; resembles _S. v. obscurus_ in size and cranial characters but darker in all pelages; similar in color to _S. v. vancouverensis_ with which _isolatus_ is sympatric but with longer tail, longer hind feet, broader rostrum and larger teeth. For comparison with _S. v. mixtus_ see account of that subspecies. _Remarks._--_S. v. isolatus_ and _S. v. vancouverensis_ seemingly approach one another morphologically more closely than do any other pair of sympatric subspecies of _Sorex vagrans_. The exceptions may be _S. v. vagrans_ and _S. v. obscurus_ which are geographically sympatric in a few places although they may be ecologically separated. _Specimens examined._--Total number, 9. BRITISH COLUMBIA, Vancouver Island: Nanaimo, 3 BS; Barclay Sound, 1 AMNH; Goldstream, 5 BS. _Marginal Records._--BRITISH COLUMBIA, Vancouver Island. (Anderson, 1947:19): Cape Scott; Victoria. =Sorex vagrans insularis= Cowan _Sorex obscurus insularis_ Cowan, Proc. Biol. Soc. Washington, 54:103, July 31, 1941. _Type._--Adult female, skin and skull; No. 3110, Prov. Mus. British Columbia; obtained on August 24, 1938, by T. T. and E. B. McCabe from Smythe Island, Bardswell Group, British Columbia. _Range._--Smythe, Townsend, and Reginald islands, British Columbia. _Diagnosis._--Size medium; average and extreme measurements of 50 specimens from within the range of the subspecies are: total length, 122.3 (111-134); tail 52.6 (46-58); hind foot, 14.6 (13-15) (Cowan, 1941:107). _Comparisons._--Smaller externally and cranially than _S. v. longicauda_ and brown instead of blackish or grayish in winter pelage. Skull broader than that of _S. v. calvertensis_ and color brown rather than blackish or grayish in winter pelage. _Remarks._--_S. v. insularis_ occurs together with _S. cinereus_ on Townsend and Smythe islands. _S. vagrans_ far outnumbered the cinereus shrew (Cowan, 1941:96). _Records of occurrence._--BRITISH COLUMBIA (Cowan, 1941:104): Smythe Island, Townsend Island, Reginald Island. =Sorex vagrans calvertensis= Cowan _Sorex obscurus calvertensis_ Cowan, Proc. Biol. Soc. Washington, 54:103, July 31, 1941. _Type._--Adult male, skin and skull; No. 1947, Prov. Mus. British Columbia; obtained on July 14, 1937, by T. T. and E. T. McCabe from Safety Cove, Calvert Island, British Columbia.