THE GEOGRAPHICAL DISTRIBUTION OF MAMMALS 163 



dea), three genera of skunks, pumas, several species of lynx 

 and some bears (Ursus) represent the Carnivora, though one 

 species each of raccoon, skunk, badger, puma and lynx range 



Fig. 75. — Kangaroo-Rat {Dipodomys philippii). — By peiinission 

 of the N.Y. Zoolog. Soc. 



into the Boreal. The American types of shrews (Blarina) 

 and moles {Scalops and Scapanus) are characteristic of the 

 Sonoran, though partially shared with the Boreal. A great 



Fig. 76. — Thirteeii-liiied Spennophile (Spcrmophilus trcdccinilinealus) . 

 — By permission of the N.Y. Zoolog. Soc. 



many peculiar rodents inhabit the Sonoran ; cotton-rats {Sig- 

 niodon), pocket-gophers (Geomys, etc.), several genera of the 

 beautiful little kangaroo-rats {Dipodomys, etc.) ; while the 



