410 FIELD MUSEUM or 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^E. 



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 o-o i-i 3~3* 



