126 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



per wing coverts and upper tail coverts plumbeous-black with a slight 

 gloss; outermost primary plumbeous-black, the next six primaries 

 (2-7, inclusive) plumbeous-black externally but with all but the apical 

 part of the inner web dark chestnut, the apical part plumbeous-black, 

 in the inner primaries, the chestnut often extending in a thin longi- 

 tudinal area next to the shaft on the outer web; innermost primaries 

 and the secondaries blackish slate; under wing coverts slate; rectrices 

 plumbeous-black with three white bars on the inner web of all but 

 the median pair, which is uniform plumbeous-black; bill black, cere 

 bluish black; iris very bright carmine; tarsus and toes deep reddish 

 orange or reddish yellow, claws black. 



Young (sexes alike). — Top and sides of head streaked black and 

 whitish, each feather black centrally and completely margined with 

 white; rest of upperparts, wings, and tail plumbeous-black to black, 

 each feather narrowly tipped with white, the white tips sometimes 

 washed with pale tawny, especially on the upper wing coverts; tail as 

 in adults; primaries tipped with white, lacking aU rufous; on inner 

 webs whitish where adults are rufescent except that in the young the 

 outermost primary is also internally white; the whitish patch much 

 mottled v\ath fuscous; the black apical portion of the feathers much 

 longer than in adults; entire underparts white or whitish, cartridge 

 buff to ivory white, heavily streaked \viih. fuscous, the streaks narrow 

 on the chin and throat, very broad on the breast and middle of 

 abdomen, becoming bars on the flanks, thighs, and under tail coverts: 

 under wing coverts whitish broadly barred with fuscous. 



Natal down. — Said to be white. 



Adult male.—Wmg 270-313 (298.2); tail 123-167 (148.5); culmen 

 from cere 15.5-18 (16.6); tarsus 37-42.4 (38.5); middle toe without 

 claw 26-27.5 (26.8 mm.) (13 specimens). 



Adultjemale.—Wmg2'l^-2,2Q.b (301.6); tail 139-161 (145.3); culmen 

 from cere 16-19.5 (17.1); tarsus 34-42 (37.7); middle toe without 

 claw 24-29 (26.3 mm.) (11 specimens). 



Range. — Tropical zone from eastern and southern Mexico (Tamauli- 

 pas; San Luis Potosi; Veracruz; Oaxaca, and Yucatan) south through 

 British Honduras, Guatemala, Honduras, Nicaragua, El Salvador, 

 Costa Rica and Panama to aU of South America (including Trinidad) 

 south as far as Peru (Amable Maria; Chyavetas, Chamicuros, and 

 Yurim.aguas, eastern Peru); Bolivia (Lower Rio Beni; Mapiri; Chi- 

 quitos and Moxos Provinces); Paraguay (Upper Parand; Sapucay); 

 and Argentina (Mocovi and Ocampo, Chaco). In Central America, 

 north to the pine districts of central Guatemala, and the mangroves 

 of coastal El Salvador breeds and migrates south; apparently absent 

 in winter. 



Type locality. — Cayenne. 



