240 BIRDS OF EUROPE AND NORTH AFRICA 



Thalassidroma pelagica (L.). Stormy Petrel. Fr. 

 Thalassidrome tempcte ; Ger. Sturmschwalbe ; Ital. Uccello 

 delle tempeste ; Swed. Stormsvala. 



(^ ? Above sooty black, rump black ; upper tail coverts 

 (tipped black), base of tail and sides of under tail coverts white ; 

 underparts smoky brown ; tail square. Bill, legs and feet black. 

 Wing 1 16-124. Tarsus 22-24. Bill lo-ii. 



Breeds. — Iceland (Westmann Islands), Faroes, Norwegian 

 Coast, Scotland (Islands of north and west and once Bass 

 Rock), S. Wales, Scilly Islands, N. and W. Ireland, Brittany, 

 S.E. Spain (Mar Menor), S. France, Corsica, Sardinia, Sicily, 

 Malta, possibly Crete, Madeira (rare). Occurs in winter in 

 E. Atlantic, south to W. Africa ; also Baltic and Adriatic Seas ; 

 rare in Mediterranean east of Malta. Has been reported from 

 Red Sea, and also east coast of N. America. 



OCEANITES. 



Tarsus longer than in "Thalassidroma"; ist phalanx of 

 middle toe as long as next two combined. 



Oceanites oceanicus (Kuhl). Wilson's Petrel. 



(^ $ Resemble " T. pelagica " but larger, and upper tail 

 coverts uniform white. Bill, legs and feet black ; basal two 

 thirds of web between toes yellow. Wing 140-158. Tarsus 32-35. 

 Bill 12. 



Breeds. — Antarctic regions, north to S. Georgia and Kerguelen 

 Land. At other times found in almost all seas. Rare visitor 

 to W. European Coast, Canary Islands, Madeira. 



OCEANODROMA. 



Tarsus less than middle toe with claw ; tail forked. 



Oceanodroma leucorrhoa leucorrhoa (Vieillot). 

 Leach's Fork-tailed Petrel. 



^ 2 Sooty brown, tinged above with slate, lateral upper 

 tail coverts white, some with grey tips. Bill, legs and feet black. 

 Wing 153-161. Tarsus 24-26. Bill 14-15. 



Breeds.— \cQ\2ind (Westmann Islands), Hebrides and Isles 

 of Mayo and Kerry ; also east coast N. America northwards 



