542 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
gray); secondaries more extensively gray than in adults; white of 
distal wing-coverts tinged with gray and metacarpal region mostly 
gray; primary coverts and primaries duller or more brownish black, 
and bill duller yellow and more tinged with horn color or olive. 
Young.—Similar to the immature plumage, but feathers of pileum 
broadly. tipped with vinaceous-buff or pale ochraceous, and with 
mesial streaks of black; interscapulars and anterior scapulars (some- 
times proximal wing-coverts also) more or less distinctly margined 
terminally with vinaceous-buff or pale avellaneous, the posterior 
scapulars very broadly tipped with the same, the tertials tipped or 
terminally margined with pale buff or buffy white; feathers of rump, 
upper tail-coverts, and tail tipped with dull vinaceous-buff or pale: 
avellaneous; white of lores and blackish postocular area tinged or 
suffused with pale avellaneous. 
Adult male.—Wing, 273-312 (299); tail, 103-118 (112); exposed 
culmen, 62-68.5 (65.3); tarsus, 23.5-26 (24.4); middle toe, 21.5-23 
(22.1).¢ ’ 
Adult female—Wing, 266-296 (286.7); tail, 97-112 (106.1); ex- 
posed culmen, 57-67 (62.4); tarsus, 23-26 (24.2); middle toe, 21.5-22 
(21.9).2 
Caribbean and Atlantic coasts and larger inland waters of South 
America, from Colombia (Punta Caiman and Trojas de Cataca, Santa. 
Marta) through Venezuela (Rio Orinoco; Rio San Juan; Rio Manimo; 
Rio Mato; Cumané; Caicar4; Altagracia; La Pricién; Laguna de 
Valéncia; Margarita Island), British Guiana (Rupurumi River; 
Ourumee), Dutch Guiana, Cayenne, Brazil (Mexiana Island; Para; 
Serra Grande and Conceiciéo, Amazonas; Rio Sao Francisco; Rio 
Araguaya; Santa Catarina; Sdo Paulo; Iguapé, Sao Paulo), Uruguay 
(Concepcién), Paraguéy (Rio Parané; Tuyt; Colénia Risso; near 
4 Hight specimens. 
Ex- 7 
Leeality. Wing. | Tail. | posed | Tarsus. Middle 
culmen, "i 
MALES, 
Three adult males from Colombia ................22..22.2-052- 298.7 | 113.3 67 24.5 22. &. 
Three adult males from Venezuela ....,.....-...-.--.-------2-- 295.7} 109.3 62.5 24 21.7 
One adult male from Amazon Valley .................-.2.2-24- 307 118 68 26 23 
One adult mate from Bolivia ................. cee cece eee eee 302 110 66 23.5 21.5 
FEMALES, 
One adult female from Colombia .................2.--22...00-+ 289 112 66 2 22 
Three adult females from Venezuela ................22--202 208. 280.7] 102.7 61.2] 23.7 21.8 
One adult female from Amazon Valley ..................---.5- 302 107 64.5 26 22 
Two adult females from Bolivia .............--.22---.22220-- 291.5} 108.7 64 24.5 21.7 
One adult female from Argentina ........2.0.. 00. cee eee eee 298 104 57.5 4 ~ 22 
