1871.] MR. J. E. HARTING ON ARCTIC BIRDS. Ill) 



The case contains a male and female of this species ; but the 

 locality whence they were procured has not been noted. 



The female of the King Duck, although as a rule somewhat 

 smaller and redder, so closely resembles the female of the Eider, as 

 to be with difficulty recognized except by comparison. A good 

 mark of distinction, however, is the relative position of the ridge of 

 feathers which runs down the centre and each side of the bill. In 

 the Eider the centre ridge (fig. 2, a a) is shorter than the lateral 

 ridges, b b ; in the King Duck (fig. 1) the reverse is the case. 



Case 18. Harlequin Duck. 



Clangula histrionica (Leach) ; Swainson, Faun. Bor.-Amer. ii. 

 p. 459. 



A male, in summer plumage, procured at Holsteinborg, on the north 

 coast of Greenland, by Capt. Elliot, in H.M.S. ' Phcenix,' in 1854. 



The female is much inferior in size to the male ; and the young 

 male resembles the female. 



Case 19. Long-tailed Duck. 



Anas glacialis, Linnaeus, Syst. Nat. i. p. 203. 

 Harelda glacialis, Leach, Gen. Zool. xii. p. 1/4. 

 A male bird ; no locality noted. 



Case 20. Red-breasted Merganser. 

 Mergus serrator, Linnaeus, Faun. Suec. p. 48. 

 A male, in summer plumage, procured at Holsteinborg, Davis 

 Straits, in 1854, by Capt. Elliot, H.M.S. ' Phoenix.' 



Case 21. Great Northern Diver. 



Colymbus glacialis, Linn. Syst. Nat. i. p. 221. 



This bird, in the summer plumage, was obtained by Mr. Anderson, 

 Surgeon to H.M.S. ' Enterprise,' on the northern coast of America 

 in 1851. 



Case 22. Black-throated Diver. 

 Colymbus arcticus, Linn. Syst. Nat. p. 221. 

 A fine specimen, in summer plumage, procured by Capt. Moore, 

 H.M.S. ' Plover,' in Behring's Straits in 1853. 



Case 23. Red-throated Diver. 



Colymbus septentrionalis, Linn. Syst. Nat. i. p. 220. 



In summer plumage. Killed in Davis Straits in 1853 by Mr. 

 Holman, Surgeon to H.M.S. ' Phoenix.' 



This species has a wide geographical range both in Europe and 

 America. Professor Baird says that on the latter continent during 

 the winter it goes as far south as Maryland, and that it is also found 

 on the Pacific coast. 



