_Range._--Transverse volcanic belt of mountains at the southern end of the Mexican Plateau. _Diagnosis._--Size small for the species; measurements of 3 specimens from Volcan Toluca, Mexico, are: total length, 98, 100, 108; tail, 35, 39, 40; hind foot, 13, 13, 14. Summer pelage Mummy Brown tending toward Olive Brown; Fuscous to Fuscous-Black in winter; skull and teeth relatively narrow. _Comparisons._--For comparison with _S. v. monticola_ see account of that subspecies. _Remarks._--The range of _S. v. orizabae_ probably is not now in contact with that of any other subspecies of _S. vagrans_, although judging by the slight degree of difference between _orizabae_ and _monticola_ the separation between the two has not been of great duration. _Sorex vagrans orizabae_ occurs with _S. saussurei saussurei_ throughout the transverse volcanic belt. _Specimens examined._--Total number, 23. MICHOACAN: Patamban, 1 BS; Nahuatzin, 3 BS; Mt. Tancitaro, 4 BS. MEXICO: Salazar, 2 BS, 1 KU; Volcan de Toluca, 3 BS. TLAXCALA: Mt. Malinche, 2 BS. PUEBLA: Mt. Orizaba, 6 BS. VERACRUZ: Cofre de Perote, 1 BS. _Marginal records._--MICHOACAN: _Patamban_. VERACRUZ: Cofre de Perote. PUEBLA: _Mt. Orizaba_. MICHOACAN: Mt. Tancitaro. =Sorex vagrans vagrans= Baird _Sorex vagrans_ Baird, Rep't Pacific R. R. Survey 8: pt. 1, Mammals, p. 15, July 14, 1858. _Sorex suckleyi_ Baird, Rep't Pacific R. R. Survey 8: pt. 1, Mammals, p. 18, July 14, 1858, type from Steilacoom, Pierce Co., Washington. _Sorex dobsoni_ Merriam, N. Amer. Fauna, 5:33, July 30, 1891, type from Alturas or Sawtooth Lake, altitude about 7200 ft., E base Sawtooth Mts., Blaine Co., Idaho. _Sorex amoenus_ Merriam, N. Amer. Fauna, 10:69, December 31, 1895, type from near Mammoth, 8000 ft., head Owens River, E slope Sierra Nevada, Mono Co., California. _Sorex nevadensis_ Merriam, N. Amer. Fauna, 10:71, December 31, 1895, type from Reese River, 6000 ft., Nye-Lander Co. line, Nevada. _Sorex shastensis_ Merriam, N. Amer. Fauna, 16:87, October 28, 1899, type from Wagon Camp, Mt. Shasta, 5700 ft., Siskiyou Co., California. _Type._--Adult male, alcoholic; No. 1675, U. S. Nat. Mus.; obtained at Shoalwater (Willapa) Bay, Pacific Co., Washington; received from J. G. Cooper, and entered in Museum catalog on October 23, 1856. _Range._--The Great Basin, and Columbia Plateau west across the mountains to the Pacific coast of northern California, Oregon, Washington and southwestern British Columbia. _Diagnosis._--Size small for the species; average and extreme measurements of 8 topotypes are: total length, 104.1 (99-109); tail, 43.3 (42-45); hind foot, 12.9 (12-14). Summer pelage ranging from (15'_k_) Cinnamon Brown through (15'_m_) Proutt's Brown to (17'_m_) Mummy Brown. Winter pelage (13''''_m_) Fuscous Black to (17''''_m_) Chaetura Black.