GYMNOCICHLA. 223 
d’. Nares aperte. 
e. Plume supranasales plus minusve criniformes. - 
GYMNOCICHLA. 
Gymnocichla, Sclater, P. Z.S. 1858, p. 274; Cat. Birds Brit. Mus. xv. p. 271. 
The most obvious feature of this genus is the bare head of the male, on which the 
feathers are reduced to hair-like bristles, the colour of the naked skin in life being 
light blue. The bill is moderately strong, the nostrils open and nearly round. The 
tarsi are rather strong, the acrotarsium distinctly divided by scutella, the planta being 
smooth. The tail is moderate and rounded. . 
Two closely allied species constitute this genus, one of which is found in the State 
of Panama and the adjoining portion of the mainland of Northern Colombia. The 
other occurs in Costa Rica and thence northwards to Honduras. 
1. Gymnocichla nudiceps. 
Myiothera nudiceps, Cassin, Pr. Ac. Phil. v. p. 106, t. 67. 
Pyriglena nudiceps, Scl. P. Z. 8. 1854, p. 113%. 
Gymnocichla nudiceps, Scl. P.Z.8. 1858, p. 274°; Cat. Birds Brit. Mus. xv. p. 272‘; Lawr. 
Ann. Lyc. N. Y. vii. p. 294°; Scl. & Salv. P.Z.S. 1864, p. 856°; Salv. P.Z.S. 1870, 
p. 1957. 
Pithys rufigularis, Lawr. Ann. Lyc. N. Y. vii. p. 293 (nec Bodd.) *. 
Myrmeciza ferruginea, Lawr. Aun. Lyc. N. Y. vii. p. 470°. 
Niger unicolor, pileo et capitis lateribus sparsim crinitis, quasi nudis, cute (ave vivo) cerulea; plaga dorsali 
celata, tectricum alarum marginihus anguste atque remigis primi margine albis, rectricibus lateralibus 
vix albo terminatis: rostro et pedibus nigris. Long. tota 6-5, ale 3-0, caude 2-3, rostri a rictu 0-95, 
tarsi 1:2. . 
Q supra ferrugineo-brunnea fere unicolor, cauda saturatiore, alis extus castaneis: subtus saturate cinnamomea, 
gula vix pallidiore, remigibus interne pallide rufescenti-fusco marginatis. (Descr. maris et femine ex 
Lion Hill, Panama. Mus. nostr.) 
Hab. Panama? (Bell), Chiriqui, Bugaba’, Mina de Chorcha’, Chitra (Arcé), Lion 
Hill (Leannan? °§ ®),—Nortuern CoLoMBia 2, 
The bare head of the male of this species, the skin being blue in life, renders it 
remarkable. ‘The feathers of the head, however, are not wholly absent, but appear as 
bristles thinly scattered over the otherwise bare surface. 
The first specimen of this species was obtained at Panama by Mr. J. G. Bell, and is 
the one now in the collection of the Academy of Natural Science of Philadelphia, 
which was described and figured by Cassin}. Other examples were secured near 
Santa Marta? in Northern Colombia, and both M‘Leannan® and Arcé7 sent us many 
specimens of both sexes from various parts of the State of Panama as far north as 
Chiriqui and the Costa Rican frontier. Whether this species is found on the Pacitic 
side of the mountains of that country, which seems probable, or not remains yet to be 
