BABWIN S MOUSE. 



59 



racterizes the following as subgeneric sections of the 

 genus Mus, all peculiar to South America, and of which 

 specimens were collected by C. Darwin, Esq., at various 

 localities, viz., Coquimbo, Valparaiso, Port Desire, Mal- 

 donado, Bahia Blanca, &c, : Scapteromys^ Oxymyc- 

 tei-us, Abrothrix, Calomys, Meithrodon, and Abrocoma. 

 (' Proc. Zool. Soc' 1837.) The two latter, indeed, he 

 considers as valid genera. 



iBk- 



35. — Darwin's Mouse. 



In North American there are two interesting genera 

 of the Muridce, which may here be noticed, namely, 

 Neotoma and Sigmodon, both established by Say and 

 Ord in the ' Journal of the Acad. Nat. Soc.,' Phila- 

 delphia. To the first genus belongs the Florida rat 

 {Neotoma Floridand), larger than the ordinary rat, with 

 soft velvety fur of a lead colour, with yellowish and 

 black hairs intermixed. The specimen described by 

 Say and Ord was discovered in a log granary situated 

 in a ruined and deserted plantation in East Florida. 



