OF BRITISH BIRDS. 25 



one is arctic, subarctic, and subtropic : — 



Turdus migratorius ; 



three are subarctic only : — ■ 



Larus Philadelphia, 

 Totanus soUtai'ius, 

 Crex Carolina ; 



six breed both in subarctic and subtropical climates : — 



Coccyzus americanus, 

 Coccyzus erythropJithahnus, 

 Ectopistes migratorius, 

 Totanus bar tr ami, 

 Totanus macularius, 

 Charadrius vociferns ; 



wliilst the breeding-range of two extends not only to subarctic and 

 subtropic climates, but also to the tropics : — 



Botaurus lentiginosus , 

 Ardea virescens. 



PALjiiARCTic Species. 



The breeding-ranges of 110 species of British Birds may be regarded as 

 Palsearctic, They extend across Europe and Asia from the Atlantic to the 

 Pacific, but are not known to reach any part of the American continent, 

 nor as a rule to extend beyond the arctic or temperate climates to the 

 tropics. There are, however, a few birds whose climatic tastes are so 

 cosmopolitan that their breeding-ranges not only reach both the subarctic 

 and subtropic climates of the Temperate Region, but cover the tropics as 

 well. These birds may be classified according to the climatic range of 

 their breeding-grounds as follows : — 



Arctic 17 



Arctic and subarctic 15 



Subarctic 15 



Subarctic and subtropic 49 



Subarctic, subtropic, and tropic ... 8 



Subtropic 1 



Subtropic and tropic 5 



110 



