Page:Birds of North and Middle America partV Ridgway.djvu/127

Rh ::: dd. Duller black, the posterior under parts blackish slate; smaller under wing-coverts broadly tipped with white. (Coast district of northeastern Colombia.) 'Gymnocichla nudiceps sancta-martæ, adult male (extralimital).
 * cc. Anterior margin of lesser wing-covert area broadly white; bill whitish or light yellowish. (Eastern Costa Rica to eastern Guatemala.)

Gymnocichla chiroleuca, adult male (p. 101). aa. General color brown above, deep tawny below. (Adult females.)
 * bb. Forehead, lores, and crown feathered. (Immature males.)
 * b. Wing-coverts brown, indistinctly tipped with rufous-tawny. (Gymnocichla nudiceps.)
 * c. Slightly paler and smaller (wing averaging 73.6, tail 55.4, culmen 19.7, tarsus 29.2)

Gymnocichla nudiceps nudiceps, adult female (p. 99).
 * cc. Slightly darker and larger (wing averaging 75.1, tail 59.3, culmen 19.9, tarsus 29.4)

Gymnocichla nudiceps erratilis, adult female (p. 101).
 * bb. Wing-coverts blackish, broadly tipped with bright tawny.

Gymnocichla chiroleuca, adult female (p. 102).

GYMNOCICHLA NUDICEPS NUDICEPS (Cassin).

Adult male. — Uniform black, slightly duller on rump, upper tail- coverts, and posterior under parts, the latter inclining to slate-black; all the wing-coverts margined terminally with white, alulæ and outer- most primary edged with white, and rectrices (except middle pair) narrowly tipped with white; smaller under wing-coverts uniform black, the under primary coverts slate color or slate-gray, broadly margined with white; inner webs of remiges broadly edged with pale gray or grayish white; naked skin of head bright light blue in life; bill black; iris brown; legs and feet horn color or dusky (bluish gray or grayish blue in life?); length (skins), 143-157 (152); wing, 73.5- 80.5 (76.1); tail, 54-60 (57.1); culmen, 19.5-21.5 (20.6); tarsus, 28.5-30.5 (29.6); middle toe, 18-20.5 (18.9).

Immature male (= Myrmelastes corvinus Lawrence and M. ceterus Bangs). — Similar to the adult male but whole pileum feathered (only the loral and orbital regions being naked) and greater wing-coverts wholly dark sooty brown or sooty black (without white tips).

Adult female. — Above plain olive-brown, russet-brown or mummy brown, the wings more rufescent (chestnut-brown), with tips of wing- coverts (rather broadly) deep cinnamon-rufous, rufous-chestnut or deep tawny; tail dark russet-brown or vandyke brown, the rectrices (except middle pair) sometimes (usually?) narrowly tipped with pale