XI 



THE PAL^ARCTIC AND NEARCTIC REGIONS 



239 



Looking through the preceding lists, we find a remark- 

 able divergence in the characteristic groups of the two 

 regions. Out of fifteen genera of Insectivora, only two are 

 common to both regions ; an amount of difference which, 

 if it occurred among larger and better known animals, 

 would produce a striking effect of diversity. In the Car- 



