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

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BIRDS OF NORTH AND MIDDLE AMERICA.
99
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).[1]

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).

bb. Forehead, lores, and crown feathered. (Immature males.)[2]

aa. General color brown above, deep tawny below. (Adult females.)

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).[3]

bb. Wing-coverts blackish, broadly tipped with bright tawny.

Gymnocichla chiroleuca, adult female (p. 102).

GYMNOCICHLA NUDICEPS NUDICEPS (Cassin).

BAKE-CROWNED ANTBIRD.

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).[4]

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


  1. Gymnocichla nudiceps sancta-martæ Ridgway, Proc. Biol. Soc. Wash., xxi, Oct. 20, 1908, 194 (Santa Marta, Colombia; coll. U. S. Nat. Mus.).
  2. The different forms distinguished by same characters as those given for adult males (c to cc).
  3. The adult female of G. nudiceps sancta-martæ not seen by me.
  4. Eight specimens.