FtJLIGULINJE. OIDEMIA. 



181 



Velvet Duck. Black Duck. White-winged Black Duck. 

 Double Scoter. Black Diver. 



Anas fusca, Linn. Syst. Nat. i. 196. Anas fusca, Lath. 

 Ind. Ornith. ii. 848. Anas fusca, Temm. Man. d'Ornith. ii. 

 854. Oidemia fusca, Velvet Scoter, MacGillivray, Brit. 

 Birds, v. 



256. OIDEMIA NIGRA. BLACK SCOTER. 



Male with a hemispherical protuberance at the base above, 

 the rounded lateral protuberances partially feathered ; both 

 mandibles black, but the upper with part of the basal knob 

 and the space including the nostrils yellow ; the feet dusky ; 

 the plumage entirely black; tail of sixteen feathers. Female 

 with the bill dusky, its basal prominence less elevated ; the 

 plumage blackish-brown above, greyish-brown beneath. Young 

 like the female. 



Male, 19, 35. Female, 18, 34. 



This species is not uncommon on some parts of our coasts 

 during winter. It is easily distinguished from the last by having 

 no white on the wing. Its trachea differs in being destitute 

 of the roundish flattened dilatation of the other species. 



Black Duck. 



Anas nigra, Linn. Syst. Nat. i. 196. Anas nigra, Lath. 

 Ind. Ornith. ii. 848. Anas nigra, Temm. Man. d'Ornith. ii. 

 856. Oidemia nigra, Black Scoter, MacGillivray, Brit. 

 Birds, v. 



257. OIDEMIA PERSPICILLATA. SURF SCOTER. 



Male with the bill having a gentle sloping protuberance in 

 front, the very large lateral prominences bare, the upper man- 

 dible with a nearly square black patch on each side at the 

 base, margined with orange, unless anteriorly, where there is 

 a bluish- white patch ; the prominent part over the nostrils 

 reddish- orange, paler at the margins, the sides toward the 

 end red, the unguis greyish-yellow ; the lower mandible flesh- 

 coloured, with the unguis darker ; the tarsi and toes orange- 

 red, the webs dusky ; the plumage deep black, glossed with 

 blue ; a patch of white on the top of the head, and another 

 on the hind-neck ; tail of fourteen feathers. Female with the 

 bill greenish-black, its basal prominences less elevated ; the 

 feet yellowish-orange ; the plumage brownish-black, darker 

 on the top of the head, and upper parts of the body. 



Male, 20, 33, 9|, l, 1 T V, 2, ,v Female, 19, 31. 



