﻿Dec, 1895.] 



SOREX OBSCURUS. 



73 



3feasureme7its.—AMevage of 8 specimens from type locality: Total 

 length, 108 mm. ; tail vertebn^, 46 mm. ; Mud foot, 12.8 mm. 



General remavls.—Sorex ohscurus is a common and widely distributed 

 species, being the prevailing Shrew in southern British Columbia and 

 northern AYashington and in tlie Rocky Mountains and Sierra Nevada. 

 A closely allied form (subspecies longicauda) occupies a narrow strip 

 along the Pacific coast from the mouth of the Columbia northward to 

 Wrangel, Alaska; another (subspecies ventraUs) inhabits the moun- 

 tains of Oaxaca, in southern Mexico. 



Specimens examined. — Total number, 175, from the following localities: 



Idaho: Salmon Eiver Mountains (type locality), 8; Pahsimeroi Mountains, 1; 

 Preus8 Mountains, 1. 



Utali: Wasatcli Mountains, 1; Provo, 1; Manti, 3. 



Colorado: Longs Peak, 1; Boulder Countj^, 8; Fort Garland, 2; 3 miles east of 

 Cocliitope Pass (Moushower Meadows), 2; Silverton, 4. 



Wyoming: Yellowstone Park, 3; Bridger Pass, 2; Woods, 1. 



Montana: St. Marys Lakes, 9; Bear Paw Mountains, 2j Bear Tootli Moun- 

 tains,' 17; Upper Stillwater, Flatliead County, 1. 



California (all in Sierra Xevada) : Carberry Rancli, Shasta County, 1; Green- 

 ville, Plumas County, 1; Donuer, 1; Pine City, east slope Mammoth Pass, 1; 

 head San Joaquin River, 3; Bishop Creek, 5; Mineral Ivmg, 2; Sequoia National 

 Park (Halsted Meadows), 4; Horse Corral Meadows, 3; Mulkey Meadows, 1; 

 North Fork Kern River, 1; East Fork Kaweah River, 7; South Fork Kern River, 

 3; Mount Whitney, 6; Round Valley, 12 miles south of Mount "Whitney, 1; 

 Kern Lakes (Soela Springs), 1. 



Oregon: Drain (not typical), 4. 



Washington (inclining toward /o?i<7/m?<f?a) : Head of Lake Chelan, 4; head of 

 Cascade River, 2 ; Eastou, 10; Lake Cushman, Olympic Mountains, 3. 



British Columbia: Nelson, 6; Ward, 1; Field, 2; Glacier, 5; Golden, 1; Kam- 

 loops (Cariboo Lake), 2; Sicamous, 1; Coldstream, Vancouver Island, 5; Comox, 

 1; Sumas, 2; Port Moody (nearly longicauda), 4. 



Alberta: Henry House, 2. 



Mean measurements of Sorex ohscurus, longicauda, and alascensis, sJioiving progressive 



geographic variation in size. 





Total 

 length. 



Tail. 



Hind 

 foot. 



No. of 

 speci- 

 mens in 

 average. 



Sorex obscv.ms : 



mm. 



mm. 



mm. 







i08 



46 



12.8 



8 





111 



46.6 



13 



3 





112 



46.5 



13.1 



15 





lit). 5 



47.6 



13.5 



9 





118.7 



52.8 



13.8 



10 



Sorex longicauda : 













123 



53.7 



13 8 



4 



Neali Bay, Washington 



131 



62 



15 



2 





128. 8 



58. 1 



15.5 



27 





129 



58. 1 



15.3 



11 



Sorex alascensis: 













122.5 



53.5 



14.6 



16 





116.3 



49.2 



14.8 



10 



