26 - MAMMALS. 



abundant and widely distributed family of the Insecti- 



vora. The assumed specific distinctions in this family 



are utterly worthless, and it is at present impossible to 



characterize the species. The following are the best 



known. (See Addenda.) 



* Ears large; auricle directed backwards; tail about as long as 

 the body ; upper anterior incisors with a second basal hook, 

 and an angular process on the inner side near the point. 



SOREX, 1, 



** Ears small, concealed by the fur; tail not longer than head; 

 auricle directed forwards; upper anterior incisor without 

 above-mentioned hook and process. . . Blarina, 2. 



/. SOREX, Linngeus. Shrews. 



1. S. platyrhinus, (Dek.) Wagner. Common Shrew. 

 A small, long-nosed, large-eared species, of a chestnut 

 color, having the tail much shorter than head and body; 

 said to be abundant in the Eastern and Middle States. 



2. S. cooperi, Bach. Western Shrew. Still smaller; 

 color light chestnut; tail nearly as long as head and 

 body. New England, N. and W. 



2. BLARINA, Gray. Short-Tailed Shrews. 

 1. B. brevicauda, (Say) Baird. Mole Shrew. Tail 

 less than one-third length of head and body; color 

 brownish gray. E. U. S., the common species. 



ORDER E. - EODENTIA. 



{The Rodents or Glires.) 



FAMILY X.— SCIURID^. 



{The Squirrels.) 

 Rodents with the molars f'.f (upper anterior often 

 deciduous), the last 4 of nearly equal size; a distinct 

 postorbital process of frontal bone; tibia and fibula 



