FIELD BOOK OF MAMMALS 



Enemies. — Snakes, Hawks, Owls, and practically all small 

 carnivorous mammals such as Weasels, Foxes, Skunks, 

 etcetera. 



Species and Subspecies of the Genus Sorex. 



This is a very large genus distributed throughout the North- 

 ern Hemisphere, and a large number of species and subspecies 

 are found in North America. Many of these forms are 

 separated from one another on cranial characters or dis- 

 tinctions difficult to set forth in a field book. As advised for 

 the other large and troublesome genera, the geographic range 

 will usually give the best clue for a preliminary determination. 



Masked Shrew. — Sarex personatus personatus I. Geoffroy. 

 As just described. Found in "Boreal and Transition 

 Zones of North America from New England to Alaska, 

 except the southern Rocky Mountains and the Cascade- 

 Sierra systems ; south in the higher Alleghenies to Tennessee 

 and North Carolina." (Merriam) Plate HI. 



Hayden Shrew.- — Sorex personatus haydeni (Baird). 



A scarcely distinguishable subspecies of personatus ranging 

 in the prairie section of North and South Dakota and 

 adjacent states and provinces. Color above, sepia brown, 

 below, ashy gray. Total length, 3.9 inches; tail vertebras, 

 1.4 inches; hind foot, .48 inch. 



Labrador Shrew. — Sorex personatus miscix Bangs. 



Larger than typical personatus, color paler and grayer. 

 Upperparts (summer) near sepia brown; underparts smoke- 

 gray; winter pelage drab gray above. Total length, 4.1 

 inches ; tail vertebras, 1.8 inches ; hind foot, .55 inch. Found 

 in Labrador. 



Arctic Shrew. — Sorex personatus arcticus^ Merriam. 



Resembling typical personatus but slightly larger, tail 

 longer, color paler. Summer pelage pale drab brown above, 

 ashy below; winter pelage dusky brownish above, silvery 

 white below. Total length, 4.2 inches; tail vertebras, 1.6 

 inches; hind foot, .5 inch. Found in region about St. 

 Michael, Norton Sound, Alaska. 



Streator Shrew. — Sorex personatus streatori Merriam. 



Larger and darker than typical personatus. Above, mixed 

 sepia brown and dusky; below, ashy gray; tail sharply bi- 

 color, dusky above, whitish below, tip dusky. Total length, 

 4.3 inches; tail vertebras, 2 inches; hind foot, .5 inch. Found 

 in southeastern Alaska. 



^ Sorex personatus arcticus should stand as Sorex cinereus hollisteri, 

 according to Jackson. 



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