456 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
outer webs brownish gray passing into white or grayish white on 
edges; tail deep brownish gray, the outer webs of rectrices narrowly 
edged with whitish; basal half (approximately) of bill pale yellowish 
or brownish (red in life ?), the terminal portion blackish; legs and feet 
pale brownish (red in life ?). 
Immature.—‘‘Like the above [adult male in breeding plumage], 
but with an. irregular collar mottled with dull white, a mottled dark 
brown crown and nape; some brownish streaks on the cheeks and 
forehead.”’¢ 
Young.—‘‘Forehead and cheeks dirty white, profusely streaked 
with brown; crown, nape, and upper surface dull umber-brown; the 
features of the mantle, wings, and tail: bordered and tipped with buff 
and grayish white.” ¢ s 
Adult male.—Wing, 400-430 (414.3); tail, 115-137 (123.8); culmen, 
84.5-89 (87.2); greatest depth of bill, 31-81.5 (31.3); tarsus, 33.5-37.5 
(36); middle toe, 23.5-24 (23.8).? 
Adult -female—Wing, 356-392 (377.6); tail, 109-126 (117.4): 
culmen, 63-77 (67.1); greatest depth of bill, 23-28. 5 (24.9); tarsus, 
28.5-33.5 (31.4); middle toe, 18.5-23.5 (20.7).° _ 
Coasts and inland waters of nearly the whole of South America, 
from Colombia (Dique, Rio Magdalena), through Venezuela (mouth 
of Rio San Juan; Caicara), British Guiana (Rupurumi River, Feb.; 
Oururnei, Dec.), Dutch Guiana, Brazil (Amazon River; Moxiona, 
Island, Dec.; Rio Jurud, Si0 Paulo; Sao Paulo), Paraguay (Colénia 
Risso; near "Puerta Braza), Argenting (San Vicente; Rio Amores, 
Nov.; "Ria de la Plata; Cape San Antonio; Ricacho Anreho), to Straits 
of Magellan, and northward along the Pacific coast of Chile (Viiia del 
Mar, near Valparaiso; Coquimbo Bay, Nov.;Ancud; Chafiaral; 
island of Chiloe), Peru (Callao Bay; Chorillos) and Ecuadér 
(Babahoyo); also upper tributaries of the Amazon River in eastern 
Ecuadér and eastern Peru (Rio Huallaga; at Yurimaguas, Nov.; 
lower Rio Ucayali, breeding; upper Rio Ucayali), island of Trinidéd 
(Port of Spain), and casual at Cozumel Island, Yucatan, and’ at 
Lake Titicaca, Peru. 
Rh{ynchops] nigra (not Rynchops nigra Linneeus) Licatenstern, Verz. Doubl., 
1823, 80, part (Paraguay; cites ‘‘Cowpeur d’eau Azar[a] 408"). 
Rhynchops nigra Lesson, Man. d’Orn., 1828, 385 (Chile)—Fraser, Proc. Zool. 
Soc, Lond., 1843, 119 (Chile).—Gray, List Birds Brit. Mus., Anseres, 1844, 
174.—Tscnunt, Fauna Peruana, Aves, 1846, 53, 307 (coast of Peru).—ScuaTER, 
Proc. Zool. Soc. Lond., 1858, 77 (e. Ecuador),—ScuteceEt, Mus. Pays-Bas, . 
Sternae, 1863, 39 (South America).—PEtzEtn, Reis. ‘Novara’-Exped., 1865, 
151 (Chile); Orn. Bras., 1870, 324, 461, part; Verh. z.-b. Ges. Wien, 1873, 
159 (Callao, Berd), Sonim and Satvin, Proc. Zool. Soc. Lond., 1878, 310 
(lower Rio Ucayali and Rio Huallaga, e. Peru).—Atnen, Bull. Mus. Comp. 
@ Saunders, Cat. Birds Brit. Mus., xxv, 1896, 157. 
> Three specimens, sex undetermined but almost certainly males. 
¢ Seven specimens of undetermined sex but probably female. 
