420 Field Museum of Natural History — Zoology, Vol. XL 



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 exiniius (Osgood). 



Microsorex winnemana Preble. (Proc. Biol. Soc. Wash., XXIII, 1910, p. loi.) 

 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 foot of iVeo5or« case broad; feet with fringe of bristly hairs. 



palustris. 



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



2-2 0-0 I-I T,-T, 



