20 GEOGRAPHICAL DISTRIBUTION 



Brought forward 338 



East to 50° 19 



East to 25° 2 



Not east of 10° . . . . 10 



— 31 



East Palsearctic 9 



Central Palsearctic 13 



391 



CiRCUMPOlAR AND CiRCUMTROPIC SPECIES. 



There are no fewer than 69 species of British Birds whose breeding- 

 range may be regarded as circumpolar or circumtropical. They may be 

 classified according to the climatic range of their breeding-grounds as 

 follows : — 



Arctic 31 



Arctic and subarctic 12 



Arctic, subarctic, and subtropic ... 3 



Subarctic and subtropic 8 



Subarctic^ subtropic, and tropic ... 3 



Subtropic and tropic 1 



Tropic 11 



69 



Of the thirty-one arctic species, the first two breed in some numbers 

 within the limits of our Islands, the next three in much smaller numbers, 

 and the next two occasionally : — 



Tetrao mutus. 

 Fulmai-us glacialis. 

 Cohjmbus arcticus. 

 Colymbus septentrionalis. 

 Phalaropus hyperboreus. 

 Emberiza nivalis. 

 Fuligula marila. 

 Anser albifrons. 

 Anas acuta. 

 Tringa canutus. 

 Tringa maritima. 

 Tringa arenaria. 

 Fuligula glacialis. 

 Charadrius kelveticus. 



