THE GEOGRAPHICAL DISTRIBUTION OF MAMMALS 



181 



a creatiiiv not nuu'h l;iru,vr tlian a liaiv, with almost riuiiinou- 

 tary aiitlors" (^Lydekker). Old World types of deer, such 

 as the Wapiti, IMoose and (^aribou, of tlie Boreal and Transi- 

 tion zones of North Aineriea, are entirely absent from the 

 Neotropical region. 



South America has an astonishingly rich and vaj'ied assem- 

 blage of rodents, botli indigenous and innnigrant, but the 



W. S. Borridgo, London. 



1>\ |U'1 IUl>,--llMl i>l 



fornuM' are nmch the more imiiortant , N'aritMJ and abuiuhint. 

 Of the foui' (Uxisions o( \hc ordtM', all of which :\vc r(^]iri^s(Mit(Hh 

 three arc immigrants from tlu^ north and the fourth is autoch- 

 tlionous, but this far outnumbers tlie other three combined. 

 Tlie hares and rabbits liavc but very {cw species, one of which 

 occurs in Brazil and is s(^paratcd by a N(M'y \\\dc iiitcMAai from 

 tlu^ one in Costa Kica. whiU^ ihc pikas :\rc absent. Of tlie scpiir- 

 rel division, only the true stpiinvls arc found, and of tiicse thciv 

 are many species, the ground-stiuirrels, marmots, prairie-tlogs 



