THE NEARCTIC REGION 



159 



The Bisons (Fig. 33) are still common to the Nearctic 

 and Palsearctic Region, though now nearly extinct in both 

 hemispheres. 



Rodents are very numerous in the Nearctic Region. 

 According to the tables here used, which have been 

 compiled from Flower and Lydekker's text-book of 



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Fig. 33.— The American Bison. 

 (Bison americanus. ) 



mammals, out of a total number of twenty-eight genera, 

 thirteen are endemic. One of these, Hwplodon, a small 

 animal resembling the Prairie-dog in its habits, and found 

 only west of the Rocky Mountains, forms a distinct family. 

 The Carnivora are also well represented, especially the 

 genera of Cats, Dogs, Bears, and Weasels, all of which, 



