20 42 Proceedings of the Royal Irish Academy. 



Colonies of vast numbers nest on the north coast of Mayo, and on 

 the cliffs and islands of Donegal, Clare, and Kerry. Unlike other Gulls, 

 immature birds are never seen at breeding stations ; they keep far out 

 to sea. 



Pagophila eburnea, Phipps. Ivory Gull. — A specimen observed by Wallace, 

 18th March, 1905, and afterwards found dead on the coast of the Mullet, 

 is in the Dublin Museum. Only two others have been obtained in 

 Ireland, one in Kerry and one on Bantry Bay ; both over sixty years 

 ago. 



Stercorarius pomatorhinus, Tenim. Pouatokhine Skua. — Irregular visitor, 

 chiefly in October and November ; has been obtained on Achill, on the 

 Mullet, and repeatedly on Killala Bay, the line of the Moy, and 

 Lough Conn, which is the route taken by occasional flocks of these birds 

 on their autumn migration towards Kerry, 1 where they have been 

 several times taken. 



Stercorarius crepidatus (J. F. Gmel.). Richardson's Skua. — Frequent visitor 

 in September and October, more rarely on its northward migration in 

 May and June; has been obtained on Achill, where immature birds are 

 oftener seen than adults ; usually observed (occasionally in large flocks) 

 in October passing south from Killala Bay, and afterwards (in 1862) on 

 Tralee Bay (Warren). 



Storcorarius parasiticus, Linn. Buffon's Skua. — An adult bird, in Barrington's 

 collection, was caught alive on a bog in Clare Island, 15th June, 1906. 

 Another was shot on Achill, 29th September, 1902, others on the Mullet 

 and on the several sections of the west coast, indicating the same line of 

 migration as in the case of other Skuas, the Shannon being also used as 

 a migration route. 2 



Alca torda, Linn. Razorbill. — There is no more remarkable colony in Ireland 

 than on the great cliff of Clare Island, where the Razorbills breed up to 

 1000 feet ; they also nest on The Bills and Inishturk. Patten saw the 

 birds arriving in the end of March. There are extensive colonies along 

 the north Mayo coast, and on all the great bird-cliffs round Ireland. 



TJria troile (Linn.). Guillemot. — The considerable colonies on Clare Island 

 are much more condensed and lower down (under 400 feet), and are far 

 less extensive than those of the Razorbill. Guillemots have been first 

 noted there from 12th to 21st March. Numbers have been noticed on 



1 Warren in Irish Nat., 1896, p. 258. - Proc. Dublin N. IJ. Soc, 7th February, 1862. 



