618 Dr. Ricwarpson's Characters of 



Dimens, Length of head and body 9 inches ; length of tail 7 

 inches. 



There is a specimen in the Museum of the Zoological Society 

 which is defective in the tail. 



Hob, Thfi Rocky Mountains. 



6. Cricetus talpoides, dnerascenti-niger^ gula caud&que aU 

 biSy saccis buccarum triangularibus pendulisy auriculis brevissimis, 

 pedibus posiicis sub-tetradadylis. 



Mole-shAped hamster, of a grayish black colour, with a white 

 chin, throat and tail ; triangular pendulous cheek-pouches ; very 

 short ears ; and only four perfect toes on the hind feet. 



Dimens. Length of head and body 7-|. inches ; of tail 1| inch. 



This animal inhabits the banks of the Saskatcehewan in lat. 52°. 

 and throws up earth like a mole. No specimen was procured by 

 the Expedition, but there is one from Hudson's Bay in the 

 Museum of the Zoological Society from which the above specific 

 character was framed. 



The molar teeth have not been examined, but the animal apr 

 pears to be referrible to Rafinesque's genus Diplostoma. 



7. Mus LEucopus, CEafinesque,^ cauda longa vestii&y corpore 

 griseo'lutescente subtus abrupte albo^ pedibus albis^ auriculis 

 magnis, 



Si/n, Mus leucopus, Rafinesque. Harlan^ Faun. Amer. p. 151. 



Less than the Mus sylvaticus (Linn.), to which it is very nearly 

 allied. 



Hab. Northern parts of America. It becomes the domestic 

 Mouse wherever a fur post is established. 



8. Arctomys pruinosa, (Pennant,) vellere corporis antice 

 rudiori canescenti ; posticc fuscescenti^ caudd pihsissima hadia 

 nigrdque. 



Hoary Marmot, with long coarse fur, particularly on the chest 

 and shoulders where it is hoary ; hind parts dull y^Uowish-browo j 

 tail blackish-brown, bushy. 



