- Myrmelastes ceterus Bangs, Proc. New Engl. Zool. Club, ii, Sept. 20, 1900, 25 (Loma del León, i. e.. Lion Hill, Panamá; coll. E. A. and O. Bangs).
- [Myrmelastes] ceterus Sharpe, Hand-list, iii, 1901, 32.
GYMNOCICHLA NUDICEPS ERRATILIS Bangs.
COSTA RICAN BARE-CROWNED ANTBIRD.
Similar to G. n. nudiceps but averaging slightly larger, the adult female averaging more intense in coloration.[1]
Adult male. — Length (skins), 147-163.5 (153.5); wing, 75.5-83 (78.9); tail, 59.5-64.5 (61.7); exposed culmen, 20-22 (20.9); tarsus, 29.5-30.5 (30); middle toe, 19-20 (19.4).[2]
Adult female. — Length (skins), 137.5-153 (148); wing, 72.5-77.5 (75.1); tail, 56-62 (59.3); exposed culmen, 19-21 (19.9); tarsus, 29-30 (29.4); middle toe, 18-19.5 (18.9).[2]
Southwestern Costa Rica (Boruca; Pozo del Rio Grande, Boruca; Térraba; Paso Reál de Térraba; Buenos Aires; El Generál; Pigres), and northwestern Panamá (Divala;[3] Mina de Chorcha; Bugaba; Chitra)?
- (?) Gymnocichla nudiceps (not Myiothera nudiceps Cassin?) Salvin, Proc. Zool. Soc. Lond., 1870, 195, part (Mina de Chorcha and Bugaba, Verágua, Panamá; crit.). — Sclater, Cat. Birds Brit. Mus.,xv, 1890, 272, part (Mina de Chorcha, Bugaba, Chiriquí, and Chitra, Panamá). — Salvin and Godman, Biol. Centr.-Am., Aves, ii, 1892, 223, part (Chiriquí, Bugaba, Minade Chorcha, and Chitra, Panamá).
- Gymnocichla nudiceps (not Myiothera nudiceps Cassin) Cherrie, Expl. Zool. Merid. Costa Rica, 1893, 42 (Boruca, Térraba, and Buenos Aires, s. w. Costa Rica; crit.).
- Gymnocichla nudiceps erratilis Bangs, Auk, xxiv, no. 3, July, 1907, 297 (Boruca, s. w. Costa Rica; coll. E. A. and 0. Bangs). — Carriker, Ann. Carnegie Mus., d, 1910, 620 (Costa Rica; crit.; habits).
GYMNOCICHLA CHIROLEUCA Sclater and Salvin.
BARE-FRONTED ANTBIRD.
Similar to G. nudiceps but adult male with bend of wing white and white tips to wing-coverts broader, much less of concealed white on back, and bill paler (plumbeous in life, whitish — at least terminally — in dried skins); adult female with wing-coverts very much darker, contrasting much more strongly with their tawny or rufescent tips.
Adult male. — General color uniform black; bend of wing, broad tips to all the wing-coverts, and broad edging to outermost feather
of alula and outermost primary, white; feathers of anterior portion
- ↑ The difference in coloration of females is by no means constant, but the average difference is very obvious.
- ↑ 2.0 2.1 Ten specimens.
- ↑ Having only adult males from that locality, I am not able to determine whether specimens of this species from Divala belong to the present form or true G. nudiceps. No specimens from, other localities in Chiriqui have been seen by me.
