Adult male. — Pileum and hindneck plain slate color, becoming paler (slate-gray) on supra-auricular region; back, scapulars, rump, and upper tail-coverts plain olivaceous-slate color (more decidedly olivaceous posteriorly) contrasting more or less strongly with slate color of hindneck and pileum; tail darker slaty olive or olivaceous- slate, the outermost rectrices usually narrowly tipped with whitish; auricular region slate color (usually somewhat darker than pileum), sometimes with very narrow shaft-streaks of whitish; lores and suborbital region slate-grayish indistinctly mottled or flecked with paler, the latter and posterior portion of the former sometimes uniform dark slate color; malar region pale gray or grayish white, indistinctly barred or transversely flecked with darker; outer web of exterior row of scapulars broadly edged with white, the white usually margined internally by a narrow line of dusky; lesser wing-coverts black, at least some of the feathers tipped, more or less distinctly, with white, the inner-anterior portion of the area occupied by a white patch; middle coverts black distinctly tipped with white; greater coverts slate color or slate-gray narrowly tipped with white; remiges similar in color to back, etc., the terminal portion of longer primaries more brownish; chin and throat white or grayish white; chest pale gray medially, darker (slate-gray) laterally, passing into light olive on flanks; breast (medially) white or yellowish white, passing into pale yellow (primrose to nearly straw yellow) on abdomen and under tail-coverts; under wing-coverts mostly pale yellow, the inner webs of remiges broadly edged with the same; maxilla dusky, paler on tomium; mandible paler (plumbeous in life); iris brown; legs and feet dusky (plumbeous in life); length (skins), 101-113 (108.5); wing, 57-63 (59.4); tail, 37.5-41.5 (39.1); culmen, 14-15.5 (14.6); tarsus, 18-20 (19.2); middle toe, 11-12 (11.4).[1]
Immature male. — Similar to the adult male but remiges distinctly more brownish (nearly broccoli brown to light olive-brown), and breast yellowish, like abdomen.
Adult female. — Pileum chestnut-brown or russet, the feathers with indistinct shaft-streaks of paler; hindneck similar but less rufescent brown; back, scapulars, and rump plain olive (varying from grayish to brownish olive); upper tail-coverts and tail sepia brown; general color of wings olive, the middle and greater coverts narrowly and rather indistinctly tipped with buffy or pale buffy brownish; a narrow orbital ring of whitish; auricular region dusky olive or slaty olive, with narrow shaft-streaks of whitish or pale buffy; malar region, chin, and throat white, usually more or less tinged with pale yellowish olive or dull yellowish; rest of under parts pale yellowish, passing into light olive or buffy olive on sides and flanks, the under
tail-coverts buffy; bill, etc., as in adult male; length (skins), 96-112
- ↑ Fifteen epecimens.
