Geographical Distribution 375 



Region, there are numbers of species which do not extend 

 beyond its area, as has been pointed out by Prof. Allen in 

 the 'Auk 5 for 1893 (p. 125). There are four Provinces 

 within the limits of the Sub- Region, each characterized by 

 peculiar species of Mammals and Birds. 



A. The Aleutian Province. 



B. The Sitkan Province. 



Both the above are of small extent. 



C. The Hudsonian Province. 



D. The Canadian Province. 



III. THE WARM TEMPERATE SUB-REGION. 



This includes the rest of the Nearctic Region to the 

 borders of the Neotropical Region. It is divided by Prof. 

 Allen into two provinces, the " Humid " and the " Arid," 

 which are again sub-divided. 



A. The Humid Province. 



In this Province is embraced warm temperate North 

 America from the sea-coast to about W. Long. ioo°, 

 excepting the Appalachian Mountains which belong, like 

 the Rocky Mountains, to the Cold Temperate Sub-Region. 

 Prof. Allen gives as characteristic of this Province, such 

 genera as Elanoides (the Swallow-tailed Kite), Dolichonyx 

 (the Rice-bird), and many other genera of Passerine birds. 

 The following Sub-Provinces or " Faunae " are recognized 

 by Dr. Hart Merriam and Prof. Allen — 



a. The Alleghanian Sub-Province. 



b. The Austro-riparian Sub-Province. 



The Austro-riparian Sub-Province is divided by Prof. Allen 

 into two " Faunae," the Carolinian Fauna, and the Louisi- 

 anian Fauna. 



