_Sorex melanogenys_ Hall, Jour. Mamm., 13:260, August 9, 1932, type from Marijilda Canyon, 8600 ft., Graham Mts. [= Pinaleno Mts.] Graham Co., Arizona.
_Type._--Adult male, skin and skull; No. 17599/24535, U. S. Biol. Surv. Coll.; obtained on August 28, 1899, by C. Hart Merriam and Vernon Bailey from San Francisco Mtn., 11,500 ft., Coconino Co., Arizona.
_Range._--Mountains of western New Mexico, eastern Arizona, and the northern Sierra Madre Occidental of Mexico.
_Diagnosis._--Size small for the species; average and extreme measurements of 12 specimens from the White Mountains, Arizona, are: total length, 104.3 (98-112); tail, 41.2 (37-45); hind foot, 12.0 (11-13). Summer pelage between (15´_m_) Proutts Brown and (15´´_m_) Bister, venter tinged with (15´_f_) Pale Ochraceous Buff; winter pelage near (17´´´_k_) Olive Brown; skull relatively broad.
_Comparisons._--For comparisons with _S. v. obscurus_ and _S. v. neomexicanus_ see accounts of those subspecies. Skull slightly larger and relatively broader than that of _S. v. orizabae_, and color slightly paler. Differs from _S. v. vagrans_ in: winter pelage grayish (near 17´´´_k_ Olive Brown) rather than blackish (17´´´´_k_ or 17´´´´_m_ Chaetura Drab or Chaetura Black); summer pelage slightly grayer; skull relatively slightly broader rostrally and interorbitally.
_Remarks._--_S. v. monticola_ intergrades gradually with _S. v. obscurus_ to the north and east; indeed the type locality is actually in this area of intergradation. So far as I know, _monticola_ is not in reproductive continuity with any other subspecies of _Sorex vagrans_. Specimens from southeastern Arizona are the smallest and seem to be the most "typical" in the sense that they are most different from _S. v. obscurus_. Some specimens from the whole length of the Rocky Mountain chain in the United States have for years been referred to _monticola_. Some of these, as I have pointed out, belong to _S. v. longiquus_, and others are intergrades between _S. v. obscurus_ and _S. v. vagrans_. Since _vagrans_ and _monticola_ resemble one another somewhat, and since topotypes of _S. v. monticola_ actually show the influence of intergradation with _obscurus_, it is easy to understand how intergrades between _obscurus_ and _vagrans_ could have been assigned to _monticola_.