PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 185 



Sthenelus * Stejneger gen. nov. 



DiAGN. — Predominant color of the adults, u-liite; young with dowvy or feathered lores, 

 the down on the sides of the bill reaching almost to the nostrils, hut not forming distinct 

 loral antice ; tertiaries and scapulars normal, not crisp; tail longer than the middle toe 

 tviih claw, cuneate; inner wehs of outer four primaries and outer uebs of the second, third, 

 fourth, and fifth sinuated; tvebs of the feet scalloped. (See fig. 8, aud compare with 

 fig. 10.) 



Nail of biU. ( ) ^^ 49083 



Anterior edge of webs of Cygnus gibhus. i^ 



49530 



Fig. 8. 

 Anterior edge of webs of Sthenelus melancorypha 



y 



Sthenelus melancorypha (Mol.). 



Black-necked Swan. 



DiAGN. — Head and necJc hrownish hlaclc ; body white; young in the 

 down piire white ; legs pale flesh -colored. 

 Syn. — 1782 — Anas melancorypha Molina, Stor. Nat., Chili, p. 207. 



VlSQ^Anas melancoripha Brandis, Uebers Molin, Naturg. Chili, p. 207. 



1788 — Anas nigricollis Gmel., Syst. Nat. I, p. 502. 



1788 — Anas melanoeephala Gmel., ut supra. 



1810— ^nas melanocorypha Molina, Stor. Nat. Chil., 2 ed. (p. 199). 



1837 — "Anas melanocorphynphus Mol." Less. Corupl. Buff. IX, p. 528. 



1839 — ^'Anas melanocoryphea Mol." Less. Eev. Zool. 1839, p. 322. 



1839 — "Anser melanocoryphus Bonn." Less., ut supra. 



Coll. Stejneger No. 716, ( ^ ad. South America). 



Length of bill from tip to mouth TO""'", to anterior border of the nos- 

 trils 40'"'", to the forward angle of the eye 95""". Breadth of bill at the 

 nostrils, 26'"™. Length of toes with claw: outer toe 111, middle toe 

 118, inner toe 95, and hind toe 21""^. Tarsus 87, longest tail feathers 

 110, and wings 450'""^. From tip of bill to the base of the frontal knob 

 43""" ; the height of which amounts to 16"'". 



The bill, in front of the tubercle and a point under the middle of the 

 nostrils, is dark plumbeous, while the tubercle, the base of the bill be- 

 hind the point mentioned and the naked lores, are yellowish brown. In 



*2£veXoi, uom. myth., father of Cycnus, Ov. ilet. 2, 367. 



