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 haK (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." "■ 



^(^u^^wa^e.— Wing, 400-430 (414.3); tail, 115-137 (123.8); cuhnen, 

 84.5-89 (87.2); greatest depth of bill, 31-31.5 (31.3); tarsus, 33.5-37.5 

 (36); middle toe, 23.5-24 (23.8).^ 



Adult female.— Wmg, 356-392 (377.6); tail, 109-126 (117.4): 

 cuhnen, 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; Mexiana 

 Island, Dec; Rio Jurua, Sao Paulo; Sao Paulo), Paraguay (Colonia 

 Risso; near Puerta Braza), Argentina (San Vicente; Rio Amores, 

 Nov.; Rio de la Plata; Cape San Antonio; Ricacho Audio), to wStraits 

 of Magellan, and northward along the Pacific coast of Chile (Vina del 

 Mar, near Valparaiso; Coquimbo Bay, Nov.; Ancud; Chanaral; 

 island of Chiloe), Peru (Callao Bay; Chorillos) and Ecuador 

 (Babahoyo); also upper tributaries of the Amazon River in eastern 

 Ecuador and eastern Peru (Rio Huallaga, at Yurim^guas, Nov.; 

 lower Rio Ucayali, breeding; upper Rio Ucayali), island of Ti^inidad 

 (Port of Spain), and casual at Cozumel Island, Yucatan, and at 

 Lake Titicaca, Peru. 



Rh[ijncho'ps\ nigra (not Rynchops nigra Linnasus) Lichtenstein, Verz. Doubl., 

 1823, 80, part (Paraguay; cites "Coupeur d'eau Azar[a] 408"). 



Rhynchops nigra Lesson, Man. d'Orn., 1828, 385 (Chile).— Feaser, Proc. Zool. 

 Soc. Lond., 1843, 119 (Chile).— Gray, List Bii-ds Brit. Mus., Anseres, 1844, 

 174. — ^TscHUDi, Fauna Peruana, Aves, 1846, 53, 307 (coast of Peru) .^Sclater, 

 Proc. Zool. Soc. Lond., 1858, 77 (e. Ecuador). — Schlegel, Mus. Pays-Bas, 

 Sternae, 1863, 39 (South America). — ^^elzeln, Reis. 'Novara'-Exped., 1865, 

 151 (Chile); Orn. Bras., 1870, 324, 461, part; Verh. z.-b. Ges. Wien, 1873, 

 159 (Callao, Peru). — Sclater and Salvin, Proc. Zool. Soc. Lond., 1873, 310 

 (lower Rio Ucayali and Rio Huallaga, e. Peru). — Allen, 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. 



