_Comparisons._--For comparison with _S. v. monticola_ see account of that subspecies. Differs from _S. v. halicoetes_ in relatively narrower and more attenuate rostrum and in less brownish underparts in winter pelage; smaller and more brownish (less grayish) than _Sorex vagrans_ from the southern Sierra Nevada. [Illustration: FIG. 18. Probable geographic ranges of _Sorex vagrans vagrans_, its derivative subspecies, and _S. v. mixtus_. 1. _S. v. vancouverensis_ 2. _S. v. vagrans_ 3. _S. v. halicoetes_ 4. _S. v. paludivagus_ 5. _S. v. obscuroides_ 6. _S. v. mixtus_ ] _Remarks._--Restriction of the range of _S. v. monticola_ to Arizona and New Mexico leaves shrews that were formerly assigned to this subspecies from Utah, Idaho, Washington and southern British Columbia unassigned. Several names are available for consideration. The name _Sorex vagrans dobsoni_ Merriam, 1891, type locality Alturas Lake, Blaine Co., Idaho, was once applied to small shrews from Idaho, Montana, Wyoming, and Utah, but was considered by Jackson to be synonymous with _S. v. monticola_. The name _Sorex vagrans amoenus_ Merriam, 1895, type locality near Mammoth, Mono Co., California, has been applied to wandering shrews from western Nevada, northeastern California and southern Oregon. _Sorex vagrans nevadensis_ Merriam, 1895, type locality Reese River on Nye-Lander Co. line, Nevada was considered by Hall (1946:119) to be synonymous with _S. v. amoenus_. Specimens of _Sorex vagrans_ west of the Cascade Mountains have long been referred to the nominate subspecies which has its type locality at Willapa Bay, Pacific Co., Washington. Over so wide an area it is only to be expected that some geographic variation is to be found. Thus specimens from central Nevada average slightly paler in summer pelage than those from the Pacific Coast or from the foothills of the Rocky Mountains. In addition there are slight average differences in size from place to place. Topotypes of _S. v. vagrans_, however, show a fair degree of variability and some are nearly as pale as the paler Great Basin stocks. Furthermore topotypical individuals of _vagrans_ can be lost in series of _S. v. amoenus_, although _amoenus_ is shorter-tailed on the average. Specimens from the western foothills of the Rocky Mountains show an amazing series of relationships with the montane _S. v. obscurus_. In Utah, as previously pointed out, complete intergradation occurs. At 1 mi. N Heath, Washington Co., Idaho, the lowland and the highland forms approach each other within a short distance and still maintain a degree of distinctness, especially in size. In northwestern Montana intergradation is extensive (Clothier, 1950). In northeastern Washington distinctly separable populations occur within a few miles of one another. In southern British Columbia some populations are clearly intergrades while at 6 mi. S Yahk intergradation seemingly has not taken place. Where some