TEENS QULLS. 393 



The gall-billed tern, S. Anglica, Mont, appears to breed 

 in some parts of Denmark, but has never been identified in 

 Scandinavia. 



Black or Swamp Terns. 



226. S. NIGRA, Briss. Svart Tarna. The Black Tern. 



D. F. 



Beak black ; legs brown ; wings and the tail, which 

 is very little cloven, dark grey, Yfith white shafts ; 

 tarsi 5-^ in. ; feet webs deeply indented ; head and neck 

 in summer black ; all under parts ash grey ; under tail 

 coverts white. In the winter the head and neck white, 

 with a spot over the root of the beak black ; length 9^ 

 in. ; beak from forehead 1^- in. ; tail goes 2 in. beyond 

 the closed wings. 



Is not common in Scandinavia, but is met with breeding 

 on many of the swamps on the eastern coast as far up at 

 least as Upland. 



227. S. LEUCOPTERA, Tern. Hvit-vingad Tarna. The 



White-winged Black Tern. D. 



Much resembles the last in size, but the tail is shorter 

 in proportion ; beak and legs red ;' rump and under 

 and upper tail coverts white ; wings grey, with white 

 shoulders ; head, back, and breast black. In the winter 

 the colours are paler. 



Has been shot only once in South Sweden, and only 

 seen once in Denmark, about the same time, probably the 

 same bird. 



The whiskered tern (S. Leucopareia, Natt.) has been ob- 

 tained accidentally in Denmark. 



Gen. Larus, L. Gulls. 



Beak larger than in the terns and compressed laterally 

 throughout its whole length ; strong, straight, bent at the tip ; 

 under mandible shortest, with a large mental angle; nostrils 

 pierced in the middle of the beak ; legs large, naked over 

 the knee; webs not so deeply indented as in the terns; 

 wings not so pointed, with the first and second primaries 



