176 Rev. F. C. R. Jourdain on the [Ibis, 



52. Stei'corarius parasiticus (L.). Arctic Skua. 



Breeds commonly in the valleys on Bear Island, the light- 

 breasted form greatly predominating. On Spitsbergen it is 

 somewhat local, but in some districts common, as at the north 

 end of Prince Charles Foreland. None o£ the birds met 

 with on Moffcn Island appeared to be nesting there, but on 

 the islands in Liefde Bay this Skua was breeding and fairly 

 common. Two clutclies taken on Bear Island on 17 June 

 must have been incubated for ten days or so. 



53. Stercorarins longicaudus Vieill. Long- tailed Skua. 

 Occasionally observed on Bear Island, where Koenig 



obtained a juvenile female apparently of this species. On 

 Spitsbergen it is not rare, though far less numerous than the 

 Arctic Skua. In Advent Bay it seems to be particularly 

 common. Here Koenig collected 10 specimens on 17 July, 



1907, and we saw several on 18 July, 1921. With regard 

 to its breeding, there is still much uncertainty, and the state- 

 ment in ' The Ibis,' 1897, p. 595, cannot be accepted without 

 reserve. At Liefde Bay a pair showed some signs of attach- 

 ment to a particular locality, and a young bird of the previous 

 year was obtained on 4 July, 1921, but a pair at Bruce City 

 showed no signs of nesting up to the end of July, and then 

 disappeared. 



54. Alca torda L, Razorbill. 



A few probably breed in the great bird col^es at the 

 south side of Bear Island, where they have been seen on 

 several occasions, and Koenig obtained a male on 30 June, 



1908. On Spitsbergen it has been definitely recorded by 

 Bruce from Prince Charles Foreland. 



55. Uria troille troille (L.) and var. ringvia Briinn. 

 Common Guillemot. 



On the cliifs from Gull Island and South Harbour to 

 Needle Rocks (Bear Island) vast numbers of Guillemots 

 breed. Of these, U. lomvia lomvia is the more numerous, but 

 the ringed variety of the Common Guillemot is not uncommon, 

 and is much more numerous than the typical form. In some 



