3i GEOGRAPHICAL DISTRIBUTION 



Species tvhose Breeding-runge extends from the Atlantic to 



Longitude 50°. 



The breediug-range of nineteen species of British Birds extends from 

 the Atlantic to about longitude 50°_, an area which embraces the valleys of 

 the Dwina and the Volga, the Caucasus, Asia Minor, and Palestine. 



None of them are exclusively arctic in their breeding-range, but three 

 species breed in arctic and subarctic climates : — 



Anihus obscurus. 



Larus fuscus. 



Cinclus aquaticus melanogaster. 



Seven species may be regarded as exclusively subarctic in their breeding- 



range 



Pratincola ruhicola. 

 Emberiza cirlns. 

 Phylloscopiis sibilatrix. 

 Locustella locustella. 

 Acrocephalus aquaticus. 

 Milvus regalis. 

 Aquila ncevia. 



Six species are not only subarctic, but also subtropic in their breeding- 

 range : — 



Regulns ignicapillus. 

 Erithacus luscinia. 

 PhylJoscopus rvfus. 

 Sylvia provincialis. 

 Noctua noctua. 

 Phalacrocorux gracuhis. 



The breeding-range of one species extends not only to subarctic and 

 fcubtropic climates but is also tropic — 



Crew bailloni ; 



^vhilst that of a second sjjecies may be regarded as exclusively subtiojiic — 



Larus nielanocephalus, 



and that of a third species as subtropic and tropic — ■ 



Arclca hnh'ilcus. 



