4IO Field Museum of Natural History — Zoology, Vol. XI. 



Part 2. Total length more than 4 inches but less than 5. 



Upper parts approaching sepia brown; under parts ashy, gray or brownish 



ash; tail more than 1.38 in. (35 mm.); 3d unicuspid not smaller than 



4th; hind foot about .47 in. (12 mm.); total length about 4 inches; 



occurs in Illinois and Wisconsin. Common Shrew. 



Sorex personatus, p. 411. 



Back about same color as sides; upper parts dark slaty plumbeous; under 



parts slightly paler and washed with ashy; third unicuspid not smaller 



than the fourth, usually slightly larger. The animal appears nearly 



uniform in color, although slightly paler on under parts; a brown 



pelage occurs in which the pelage is everywhere chestnut brown, 



somewhat paler on the under parts; found in Wisconsin and perhaps 



extreme northern Illinois. Smoky Shrew. Sorex fumeus, p. 415. 



Color of back noticeably different from the sides; back very dark brown; 



sides fulvous brown or buffy brown; under parts ashy plumbeous, more 



or less washed with brownish ; third unicuspid usually decidedly larger 



than the fourth; a brown pelage occurs in summer very similar to 



that of Sorex fumeus; occurs in Wisconsin but has not been taken in 



Illinois. Richardson's Shrew. Sorex richardsonii, p. 414. 



SECTION 2. Total length more than 5.25 inches; feet fringed. 



Back blackish seal brown; under parts ashy white; feet 



fringed; occurs within our limits from central Wisconsin 



northward. Water Shrew or Marsh Shrew. 



Neosorex palustris, p. 421. 

 Foot of Neosorex palustris. 



Subfamily SORICIN.^. 



Ends of teeth and crown tubercles colored red; zygomata absent. 



Genus SOREX Linnaeus. 



Sorex Linnaeus, Syst. Nat., X ed., I, 1758, p. 53. Type Sorex araneus 



Linnaeus. 



Size small; tail more than one-third the total length; external ear 

 not entirely concealed by fur; snout pointed; first upper incisor long, 

 curved and hook-like; inner sides of canines and incisors without 

 secondary cusps; skull delicate; brain case broad; milk dentition not 

 functional . 



Dental formula: I. ^^> C.^^- Pm. ^^> M. ^^ = 32. 

 2-2 0-0 i-i 3-3 



