_Comparisons._--From _S. v. obscurus_, _S. v. longiquus_ differs as follows: size smaller; skull smaller in all dimensions although similar in proportion. From _S. v. soperi_, _S. v. longiquus_ differs in: size smaller; color paler in summer pelage. From _S. v. vagrans_, _S. v. longiquus_ differs in: color paler in summer pelage, less brownish; color of venter extending higher on flanks; venter Pale Smoke Gray, rarely tinged with buffy rather than usually tinged with buffy. From _S. v. monticola_, _S. v. longiquus_ differs in: summer pelage slightly paler, venter Pale Smoke Gray rather than suffused with buffy. _Remarks._--The subspecies _longiquus_ is obviously derived from the neighboring _S. v. obscurus_ and differs from it mainly in size. Some specimens of obscurus from western Montana show evidences of intergradation with _S. v. vagrans_ in possessing a somewhat buffy belly and these are thus more strikingly different from _longiquus_ than are other specimens of _obscurus_. Many specimens of _obscurus_ from the eastern slope of the Lewis and Clark Range in Montana show the tricolored pattern seen in many specimens of _longiquus_. The smallest individuals of longiquus are found on the Big Snowy Mountains. Intergradation with _obscurus_ is seen in specimens here referred to _S. v. obscurus_ from the Big Belt Mountains. _Specimens examined._--Total number, 45. MONTANA: _Hill Co._: Bearpaw Mts., 5 UM, 2 BS. _Phillips Co._: Zortman, 1 BS. _Chouteau Co._: type locality, 3 UM; Highwood Mts., 13 BS. _Cascade Co._: Neihart, Little Belt Mts., 1 BS. _Judith Basin Co._: 3 mi. W Geyser, 4100 ft., 1 KU; Otter Creek, 10 mi. SW Geyser, 1 BS; Dry Wolf Creek, 20 mi. SW Stanford, 1 BS. Buffalo, 13 mi. W Buffalo Canyon, 2 BS. _Fergus Co._: Moccasin Mts., 15 mi. NW Hilger, 3 BS; Judith Mts., 17 mi. NE Lewiston, 1 BS; 15 mi. S Heath, N. fork Flat Willow Creek, Big Snowy Mts., 1 BS; Timber Creek, Big Snowy Mts., 1 BS; Crystal Lake, 6000 ft., Big Snowy Mts., 2 UM; Rocky Creek, 5600 ft., Big Snowy Mts., 3 UM; Big Snowy Mts., 3 BS. _Meagher Co._: Sheep Creek, 16 mi. N White Sulphur Springs, Little Belt Mts., 1 BS. _Marginal records._--MONTANA: Bearpaw Mts.; Zortman; Big Snowy Mts.; 16 mi. N White Sulphur Springs; Highwood Mts. =Sorex vagrans neomexicanus= Bailey _Sorex obscurus neomexicanus_ Bailey, Proc. Biol. Soc. Washington, 26:133, May 21, 1913. _Type._--Adult male, skin and skull; No. 100440, U. S. Biol. Surv. Coll.; obtained on May 29, 1900, by Vernon Bailey, from Cloudcroft, 9000 ft., Otero Co., New Mexico. _Range._--Sacramento and Capitan Mountains of New Mexico. _Diagnosis._--Size medium for the species; average and extreme measurements of 4 topotypes are: total length, 105.2 (103-107); tail, 41.0 (39-42); hind foot, 13.1 (12.5-14). Color near Olive Brown in summer; winter pelage unknown; skull large and relatively broad; teeth relatively large.