FAUNA AMERICANA. 147 



Rafinesque, which we mention as mere indica- 

 tions of varieties, or perhaps some new species. 

 1. Lemmus vittatus; inhabits Kentucky. 2. L. tal- 

 poides, also of Kentucky. 3. L. noveboracensis, 

 together with the Mynomes pratensis, figured by 

 Wilson, Amer. Ornithol. vol. vi. tab. 50. fig. 3. 

 which is an Arvicola. 



Genus. 



Mus, Linn. Erxleb. Briss. Cuv. Geoff. Illig. &c. 

 Rattus, Penn. the Rat. 



CHARACTERS. 



C Incisor 2. 

 r superior 8. < Canine 0. 



Dental fonniJa.— Teeth 16. \ > ?'*°!''^' J' 



] r Incisor 2. 



1, inferior 8. < Canine 0. 



C Molar 6. 



Superior incisors cuneiform ; the inferior com- 

 pressed and sharp. 



Molars simple, crowns furnished with blunt 

 tubercles, the anterior being the largiest both 

 above and below; snout rather elongated; ears 

 oblong or rounded, nearly naked; no pouches. 



Anterior feet with four clawed toes, and a wart 

 covered with an obtuse nail in place of a thumb ; 

 the posterior feet moderately elongated, with five 

 clawed toes; tail long, tapering, naked and scaly. 

 Some of the hairs on the body are longer, and 

 more stiff than others ; for which are sometimes 

 substituted flattened spines, similar to those on 

 the body of the echimys. 



