542 



BULLETIN 50, UNITED SIWTES 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-bufY 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. 



Advlt male.— Wing, 273-312 (299); tail, 103-118 (112); exposed 

 cuhnen, 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 cuhiien, 57-67 (62.4); tarsus, 23-26 (24.2); middle toe, 21.5-22 

 (21.9).« 



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; Cumana; Caicara; Altagracia; La Pricion; Laguna dc 

 Valencia; Margarita Island), British Guiana (Rupurumi River; 

 Ourumee), Dutch Guiana, Cayenne, Brazil (Mexiana Island; Para: 

 Serra Grande and Conceiciao, Amazonas; Rio Siio Francisco; Rio 

 Araguaya; Santa Catarina; wSao Paulo; Iguape, Sao Paulo), Uruguay 

 (Concepcion), Paraguay (Rio Parana; Tuyii; Colonia Risso; near 



« Eight specimens. 



Lcca'.ily. 



MALES. 



Three adult males from Colombia 



Three adult males from Venezuela 



One adult male from Amazon Valley . , 

 One adult ma'.e from Bolivia 



FEMALES. 



One adult female from Colombia 



Three adult females from Venezuela . . 

 One adult fetnale from Amazon Valley 



Two adult females from Molivia 



One adult female from Argentina 



Wing. 



298.7 

 295. 7 

 307 

 .302 



2.S9 

 2S0. 

 :102 

 291. 

 298 



Tail. 



113.3 

 109.3 



lis 

 no 



112 

 102.7 

 107 

 lOS. 7 

 lot 



Ex- 

 posed 

 ciilmen. 



(;i.2 



64.5 

 04 



Tarsus. 



24. 5 

 24 

 26 

 2^.5 



24 



2.!. 7 

 20 

 24.5 

 24 



Middle 

 toe. 



22.5 

 21.7 

 23 

 21.5 



22 



21. '^ 

 22 

 21.7 



