ALLEN ON GEOGRAPHICAL, DISTRIBUTION OF MAMMALS. 341 



Europwo- Asiatic Region. The Europaeo-Asiatic Eegion embraces a far 

 greater (about four times greater) area than the North American, and is 

 physically much more highly diversified. It is similarly divisible into 

 a Cold Temperate Subregion and a Warm Temperate Subregion, and is 

 further differentiated into a number of well-marked provinces, two of 

 which belong to the Cold Temperate Subregion, and three or more to 

 the Warm Temperate Subregion.* 



Genera of the Europao- Asiatic Region. 



[NOTE. A few almost exclusively tropical genera, -which barely reach or doubtfully extend a short 

 distance over the southern boundary of the region, are omitted as being not properly faunal elements 

 of the region. 



The names of circumpolar genera are in italics ; those of genera peculiar to the region in SMALL CAPI- 

 TALS.] 



* I am far from sure that what is here recognized as the " Mediterranean Province'" 

 should not be subdivided, and the Easterner Persian division recognized as a "Persian 

 Province". If the Eastern, Middle, and Western divisions of the North American Ee- 

 gion are to be accorded the rank of " Provinces ", it may be necessary to admit, on similar 

 grounds, a "Japanese Province"; but I am not at present prepared to adopt these 

 divisions as "Provinces". To make the Provinces of the North American and 

 EuropaBo-Asiatic Regions more nearly co-ordinate, I should prefer to unite the Middle 

 and Western Provinces of the North American Region 'as forming a single Province. 

 In fact, it seems doubtful whether the North American Region is differentiated into 

 primary divisions that should be regarded as having co-ordinate rank with the Medi- 

 terranean and Manchurian divisions of the Europseo- Asiatic Region. 



