FAUNA AMERICANA. 1 5 1 



1. Mils leiicopus. 



Char. Essent. Colour brownish-fawn above, 

 white beneath ; head yellow ; ears large ; tail as 

 long as the body, pale brown above, gray beneath^ 

 feet white. 



Dimensions. Total lensfth five inches. 



2. Mus nigricans, (black rat, or wood-rat.) 



Char. Essent. Colour blackish above, gray 

 beneath ; tail black, longer than the body. 



Dimensions. Total length, six inches. (Monthly 

 Magazine, 1818.) 



The last mentioned species is nothing more 

 than the Mus ratttis, Linn. 



Genus. 



Pseudostoma, Say, Long's Exped. to the Rocky 

 Mountains, vol. i. p. 406. 



Geomys, Rafinesque, Month. Mag. 



CHARACTERS. 



/r Incisor 2. 

 superior 10. < Canine 0. 

 C Molar 8. 

 I ( Incisor 2. 



^inferior 10. < Canine 0. 

 C Molar 8. 



The incisors are not covered by the lips, but 

 always remain exposed to view ; they are strong, 

 and truncated in their entire width at tip; the 

 superior ones are each marked by a deep longi- 

 tudinal groove near the middle, and by a smaller 

 one at the inner margin. 



