26 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



yellowish white, usually flecked, more or less, with dusky; inner webs 

 of remiges broadly edged (except terminally) with yellowish white; 

 bill black; iris brown; legs and feet dusky (plumbeous in life); 

 length (skins), 150-167 (157); wing, 72-80 (74.9); tail, 62-71 (67.5); 

 culmen, 20-22.5 (21.4); tarsus, 21-23.5 (22.4); middle toe, 13.5-14.5 

 (13.9).« 



Adult female. — Head and neck black narrowly streaked with white, 

 the streaks much broader (sometimes spot-like) on chin and throat; 

 back, scapulars, rump, and upper tail-coverts plain sepia brown to 

 slaty brown, the feathers of back slightly darker centrally; wings and 

 tail darker (the tail brownish black or blackish brown) , all, or nearly all, 

 the wing-coverts marked with a small roundish or triangular terminal 

 spot of white; under parts, posterior to throat or upper chest, varying 

 from nearly slate-gray to olive-drab, the pectoral region streaked 

 with white; under tail-coverts deeper brown, narrowly streaked 

 (sometimes also somewhat spotted) with white; under wing-coverts 

 and broad edgings to inner webs of remiges yellowish white or pale 

 creamy yellow; maxilla black, mandible paler (plumbeous m life); 

 iris dark brown or brownish gray; legs and feet plumbeous; length 

 (sldns), 148-166 (157); wmg, 70-77 (72.9); tail, 60-70.5 (66.7); 

 culmen, 19.5-22 (20.7); tarsus, 21-23.5 (22.4); middle toe, 13-15 

 (14).^ 



Young male {first plumage) . — Similar to the adult male but texture 

 of plumage much softer, black of back, etc., duller, and chest with 

 narrow shaft-streaks of white. 



Young female (first plumage). — Similar to adult female but duller 

 in color, with black of head and neck replaced by dark sooty brown 

 above and paler sooty brown below, and streaks much less distinct, 

 those on pileum pale brownish or tinged with brown, instead of pure 

 white, those of pectoral area broader but much less distinct and also 

 suffused with pale brownish. 



Southwestern Costa Rica (Pozo Aziil de Pirris; Pozo del Pit^l, 

 Rio Naranjo; El Pozo de Terraba; Trojas de Rio Grande; El 



