_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_. Throughout most of its range, _S. v. monticola_ is the only _Sorex_ present. In some places _monticola_ may occur with _S. nanus_ or _S. merriami_. _S. v. monticola_ occurs with the water shrew in southeastern Arizona. _Specimens examined._--Total number, 80. ARIZONA: _Coconino Co._: San Francisco Mtn., 3 BS, 6 CMNH. _Apache Co._: Spruce Creek, Tunitcha Mts., 7 BS; Springerville, 1 BS; North Fork White River, White Mts., 12 SD; White River, Horseshoe Cienega, 8300 ft., White Mts., 5 BS; Mt. Thomas, 9500 to 11,000 ft., White Mts., 12 BS; Little Colorado River, White Mts., 4 BS; near head Burro Creek, 9000 ft., White Mts., 1 BS. _Graham Co._: Graham Mts., 9200 ft., 2 BS. _Greenlee Co._: Prieto Plateau, 9000 ft., S. end Blue Range, 1 BS. _Pima Co._: Summerhaven, 7500 ft., Santa Catalina Mts., 3 BS, 1 SD. _Cochise Co._: Fly Park, Chiricahua Mts., 4 BS; Rustler Park, Chiricahua Mts., 1 SD; Long Park, Chiricahua Mts., 1 UM; Huachuca Mts., 1 BS. _Santa Cruz Co._: Stone Cabin Canyon, 8500 ft., Santa Rita Mts., 1 BS. NEW MEXICO: _San Juan Co._: Chusca Mts., 1 BS. _Catron Co._: Mogollon Mts., 3 BS; 10 mi. E Mogollon, 1 KU. _Socorro Co._: Copper Canyon, Magdalena Mts., 3 BS. _Sierra Co._: Mimbres Mts., near Kingston, 1 BS. CHIHUAHUA: Sierra Madre, near Guadalupe y Calvo, 5 BS. _Marginal records._--ARIZONA: Tunitcha Mts. NEW MEXICO: Chusca Mts.; Copper Canyon, Magdalena Mts.; Mimbres Mts., near Kingston. CHIHUAHUA: Guadalupe y Calvo. ARIZONA: Huachuca Mts.; Santa Catalina Mts.; White River, Horseshoe Cienega, 8300 ft., White Mts.; San Francisco Mtn. =Sorex vagrans orizabae= Merriam _Sorex orizabae_ Merriam, N. Amer. Fauna, 10:71, December 31, 1895. _Sorex vagrans orizabae_, Jackson, N. Amer. Fauna, 51:113, July 24, 1928. _Type._--Adult female, skin and skull; No. 53633, U. S. Biol. Surv. Coll.; obtained on April 24, 1893, by E. W. Nelson from W slope of Mt. Orizaba, 9,500 ft., Puebla.