_Type._--First year male, skin and skull; No. 87332, Univ. Michigan Mus. Zool.; obtained on July 21, 1942, by Emmet T. Hooper from 25 mi. ESE Big Sandy, Eagle Creek, Chouteau Co., Montana, original no. 2184.
_Range._--Central Montana; marginal localities are: Bearpaw Mts., Zortman, Big Snowy Mts., Buffalo, Little Belt Mts.
_Diagnosis._--Size small for the species; measurements of three topotypes are: total length, 101, 105, 108; tail, 39, 40, 42; hind foot, 11.5, 11.5, 12. Color pale; summer pelage: back near (17´´´_k_) Olive Brown but hairs of dorsum with a pale, buffy band proximal from the tips which imparts a pale over-all appearance; flanks near Wood Brown; underparts Pale Smoke Gray, usually not with a buffy wash; color of underparts often extending along margin of upper lip. Skull small for species; rostrum relatively broad and heavy; relatively broad interorbitally.
_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.