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SPERMOPHILUS RI C HARD S O NIL— Sab. 



Richardson's Spebmophiie. 

 PLATE L.— Natural size. 



Sciuro Hudsonio aliquantulum major ; dorso fulvescente, pilis nigris 

 mixtis ; ventre fusco-rufescens ; cauda mediocri, ad extremum nigra, 

 apice fulva ; auriculis brevissimis, 



CHAEACTEBB. 



A little larger than the Hudson's Bay squirrel; hack, yellowish-gray, 

 interspersed with black hair ; belly, pale grayish-orange ; tail, rather short, 

 black at the extremity, tipped with fawn colour ; ears, very short. 



SYNONYMBS. 



Arctomts Richardsonii, Sabine, Linn. Trans., vol. xiii., p. 589, t. 28. 



" " Idem, Franklin's Jour., p. 662. 



" " Griffith's An. Kingd., vol. v., p. 246. 



Tawney American Marmot, Godm., Nat. Hist., vol. ii., p. HI. 

 Arctomys (SpERMOPHims) Richardsonii, Rich., F. B. A., p. 164, pi. 11. 



DESCEIPTION. 



Body, rather short and thick ; forehead, arched ; nose, blunt, covered 

 with short hairs ; margins of the nostrils, and septum, naked ; vi^hiskers, 

 few, and shorter than the head ; eyes, large ; ears, small, rounded, 

 clothed with short hairs on both surfaces ; cheek-pouches, of moderate 

 size. The fur on the whole body is short and fine. 



Legs, rather short ; nails, long, weak, compressed, and slightly arched. 

 On the fore-feet there are four toes and a minute thumb ; the toes are 

 covered on the upper surface with short hairs which reach the root of 

 the nails. Palms, naked, containing five callosities. The thumb has a 

 very short joint and is covered by a convex nail. Middle toe longest ; 

 the first and third are of equal length, and the outer one is shortest and 

 -arthest back. 



On the hind-feet there are five toes. The three middle ones are nearly 

 o/ equal length, the other two are smaller, and are situated farther back ; 



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