RODENTIA. 305 



DUVAUCEL'S SQUIRREL. 

 PLATE XXIV, 



IN size equal to the cat squirrel, with a long flat 

 tail ; the upper parts and outside of the limbs ru- 

 fous ; nose, cheeks, throat, breast, flanks, abdomen, 

 and central under side of tail, white. Native of Ma- 

 dagascar. 



We have not space even to name the numerous 

 species known; Mr. Waterhouse enumerating, in 

 Europe and Northern Asia, five species ; in North 

 America, twenty; Africa, five; India and Islands, 

 twenty-five ; South America and West Indies, fivfc, 

 making sixty. The genus PTEROMYS, or Flying 

 Squirrel, whose form is well known, though there be 

 but one species in Europe, we pass without further 

 notice. ^ 



The farther divisions of the family, which have 

 slight differences in dentition, and are known under 

 the names of the genera Tamias, Xerus, Spermo- 

 philus, or Marmots, with cheek pouehes ; and 

 Arctomys, without cheek pouches, and a new genus ? 

 Aplodontia* which terminates the Sciuridce, includ- 



