36 



Merriowi Geographic Distribution of Life. 



TABLE SHOWING THE GEOGRAPHIC DISTRIBUTION OF NORTH 

 AMERICAN GENERA OF NON-PELAGIC MAMMALS OCCURRING 

 NORTH OF MEXICO. 



Boreal (reuera. 



Transition tfonc Genera* 



Synaptomys 



( i< in i'n Inhabiting both l><n'<'l <in<i ,sv///o/v/// Zuitfx. 



Sciuropterus 

 Sciurus 



Sperfnopbilus 



Canis 



Lutra 

 Lepus 



* Having one species in Sonoran Zone or reaching Sonoran. 



t Having one species in Boreal Zone or reaching southern edge of Boreal. 



