THE PAL^ARCTIC AND NEARCTIC REGIONS 



245 



PAL^ARCTIC. 



CoLUMBiD^ (Pigeons) : 

 101. Turtur(8). 



Pteroclid^ (Sand grouse) 



102. Pterocles (6). 



103. Syrrhaptes (2). 



Phasianid^ (Pheasants) : 



104. Phasianus (17). 



105. Pucrasia (2). 



106. Chrysolophus (2). 



107. Crossoptilon (5). 



108. Lophophorus (1). 



109. Ithaginis (3). 



110. Caccabis (5). 



111. Francolinus (2). 



112. Perdix(4). 



113. Cotumix(2). 



114. Teti-aophasis (2). 



115. Tetraogallus (5). 



Tetraonid^ (Grouse) : 



116. Tetrastes (3). 



117. Tetrao(5). 



TuRNiciD^. (Fighting] 

 Quails) : 

 118. Tiu-nix(3). 



BOTH. 



COLUMBID.i; : 



52. Columba (14.3). 



Tetraonid.?; : 



53. Lagopus (5.4). 



54. Canachites (2) = 



Dendragapus (3) 



NEARCTIC. 



COLUMBID^ : 



101. Ectopistes (1). 



102. Zenaidura (1). 



103. Columbigallina (1). 



104. Scardafella (1). 



Phasianid^ : 

 105.2Meleagris (1). 



Tetkaonid.e : 



106. Colinus (3). 



107. Oreortyx(2). 



108. Callipepla(3)' 



109. Cyrtonyx (1). 



110. Bonasa (1). 



111. Tympanuchus (2). 



112. Pediocetes (1). 

 118. Centrocercus (1). 



By merely glancing over these lists we see at once how 

 greatly the genera in either the first or third column ex- 

 ceeds those in the middle column. This tells us that the 

 speciality of each region in relation to the other is very 

 much greater than their similarity. In order, however, 

 to bring out these differences and resemblances more 

 clearly, and to show what they imply, the facts are sum- 

 marised in the following table of the families, giving the 

 distribution of their genera and species in the same order 

 as in the preceding lists : — 



