420 Fretp Musrum or Narurat History — Zoétocy, Vor. XI. 
aia EH z : _ f 
f fad ofc lo 
We 
Ge 
AN 
: Zk 
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DAK. g Ass: 
( & Kann prae 
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NEBA, Pe 2; 
é OHIO 
ILL. \IND. 5 
KANS. Mo. * By d Microsorex hoy! 
ae cesses 
any. C- , M. h. alnorum 
ees ARK. Ss. c. : M. wlaonemana 
LL A. ec 
= ALA. > Area of intergradationt| 
Z 
Map illustrating approximate distribution of the Shrews belonging to the genus Microsorex in 
eastern United States and Canada. 
Microsorex hoyi (BAIRD). Type locality — Racine, Wisconsin. Description as 
previously given. 
Microsorex alnorum (PREBLE). (N. Amer. Fauna, No. 22, 1902, p. 72.) Type 
locality — Robinson Portage, Keewatin, Canada. Grayer than hoyi above, 
without brownish on under parts; feet larger and also cranial differences; ap- 
proaches very closely Microsorex eximius (Osgood). 
Microsorex winnemana PREBLE. (Proc. Biol. Soc. Wash., XXIII, gro, p. tot.) 
Type locality — Fairfax County (bank of Potomac River near Stubblefield 
Falls), Virginia. ‘‘Similar to Microsorex hoyi, but considerably smaller; brain- 
case proportionally higher and more rounded’’ (Preble). Total length of 
type about 3.1 in. (78 mm.); tail vertebrae, about 1.2 in. (30 mm.). 
Genus NEOSOREX Baird. 
Neosorex Baird, Mammals N. Amer., 1857, p. 11. Type Neosorex 
navigator Baird. 
Fourth upper incisor well developed; no second- 
ary cusps on inner side of canines or incisors; brain- 
Hind int of Neosorex Case broad; feet with fringe of bristly hairs. 
GLUstY1S. 
Dental formula: I. f28 eS Be 373 25. 
2-2 0-0 I-1 3-3 
