64 



mill) GALLEKY. 



Torrent Duck (M. annuta) (688), frequents the high mountain torrents 

 of the Andes, and forms a link between the true Mergansers and the 

 stiff-tailed Diving-Ducks, but differs from the former in having no teeth 

 on the edges of the mandibles and the bend of the wing armed with a 

 strong spur. The New Zealand Soft-billed Duck (Hymenolamus mala- 

 corhynchus} (689) is worthy of special notice on account of its remark- 

 able bill with a dependent membrane, suited for the capture of insect 

 larvae on which it principally feeds. 



[Case 37.] The Stiff-tailed Ducks, so-called from their rather long, narrow, rigid 

 tail-feathers which are often carried erect when the bird is swimming, 

 include several genera of which representatives will be found in the 

 White-headed and Australian species of Erismatura (690, 691), 

 the American Masked form (Nomonyx] (693), and the Musk Duck 

 (Biziura lobatd) (692). The latter, whose name is derived from the 

 strong musky odour of the sitting female, frequents the seas as well as 

 the lakes of Australia and Tasmania. It is much the largest species of 

 the group, and remarkable on account of the leathery chin-pouch found 

 in both sexes. The appendage opens under the tongue and is largest 

 in the male, giving the bird a very peculiar appearance. Like its 

 allies it is an expert diver and can remain for a long time submerged. 

 It seldom, if ever, flies in the daytime, but will do so at night. The 

 nest is placed in a swamp or in a bank, and contains two or three olive- 

 coloured eggs. 



Of Sea-Ducks we may first mention the Eiders, which are all in- 

 habitants of northern waters, and are represented by S teller's Eider 

 (Heniconetta stelleri) (694) and the King and Common Eiders (Somateria 

 spectabilis (695) and S. mollissima (696)), all of which are included in 

 the British List. Their nests supply the " Eider down " which forms an 

 important article of export in countries such as Norway, where the 

 common species is protected by law and consequently exceedingly 

 numerous. It will be noted that the series exhibited shows the 



[Case 37.1 changes from summer to winter plumage in both the old and young 

 drakes, the " eclipse " or intermediate autumn plumage being specially 

 interesting. 



[Case 88.] The South-American Rosy-billed Duck (Metopiana] (697) is often 

 kept on ornamental waters in this country. The Pochards (Netta 

 and Nyroca) include the Red-crested (698) and Ferruginous (701) 

 species, both of which occur in Great Britain as occasional stragglers as 

 well as the Common Pochard (699) and the Canvas-back (700) from 

 North America, famous for its excellent qualities as a bird for the table. 

 The Tufted Duck (Fuligula) (703) breeds plentifully on the lochs and 

 ponds of Great Britain and Ireland, and is easily recognised by ike 

 long drooping occipital crest developed in both sexes ; the Scaup 



