ALLEN ON GEOGRAPHICAL DISTRIBUTION OF MAMMALS. 361 



of the Iiido- African Kealm, how strong an affinity exists between the 

 African and Indian Regions, two-fifths of all the genera of the Indian 

 Region which have an extraliinital range occurring also in the African 

 Eegion. The clos*e affinity of the two provinces of the Indian Eegion 

 is shown by the fact that two-thirds of the peculiar Indian genera found 

 in the Northern or Continental division range also into the Southern or 

 Insular. As will be shown later, the Insular Province is the more 

 highly specialized of the two divisions. 



Genera of the Continental Province. 



'Restricted to Ceylon and Southern Hindostan. 

 Restricted to the northern part. 

 3 Hindostan generally. 



4 Also tropics of America. 

 s Whole northern hemisphere. 

 6 Also African. 



Summary. 



Whole aumber .\ , 



Restricted to the Indian Region 



R'stricted (almost wholly) to the province 



Other genera ranging over most of the Indian Region and restricted to it 



Common to the African Region 



Common to portions of the Europaeo- Asiatic Region 



Ranging over most of the northern hemisphere 



Nearly cosmopolite 



JRestricted to Southern Hindostan and Ceylon 



Bull. iv. No. 2 4 



94 

 43 

 16 

 27 

 28 

 34 

 17 

 10 

 5 



