.CERCOMACRA. 215: 
(Arcé), Angostura (Carmiol 1), Pacuare, Pozo Azul de Pirris, Jimenez (Zeledon 1°), 
San Carlos (Boucard 4) ; Panama, Bugaba !!, Mina de Chorca !!, Santa Fé 1° (Arcé), 
Lion Hill (M‘Leannan® 19 2°), Panama (A. Hi. Markham 12), Chepo (Arcé).— 
CotomBiA!; Ecuapor®; Peru !’; Guiana >, 
Mr. Sclater first described this species in 1855 as a Pyriglena from Bogota trade skins 
in the British Museum }, and a few years later it was discovered in Mexico 4 and Guate- 
mala ®, and afterwards in the State of Panama !9 and in Costa Rica 1°. It is now known 
as a common bird in the low-lying hot forest districts of Central America on the eastern 
side of the mountain-range northwards of Costa Rica, and from there to the mainland 
of South America on both sides of the Cordillera. 
A little variation is to be traced between birds selected out of the series before us, 
but the differences do not seem to be localized. One of the darkest birds is from Santa 
Fé, in the State of Panama; others from the line of Railway being paler, like the 
Mexican, Guatemalan, and Guianan birds. | 
The synonyms of this bird are not many. Mr. Lawrence first placed the Panama birds 
as Hypocnemts schistacea !°, which is a’bird of the Upper Amazons and still retained in 
Hypocnemis. ‘he same author subsequently described a young male from the same 
country as Dysithamnus rufiventris 2°, | 
Cercomacra tyrannina is a bird of the dense tropical forest, where it lives amongst 
the underwood. We noticed nothing of special interest in its habits, and little has 
been recorded by other travellers. Stolzmann, who observed it as high as Chirimobo 
in Peru (5400 feet), says that it lives both in the interior of the forests and on the edges, 
but always in pairs. Its cry is peculiar, and unlike that of other Formicariide 17. 
2. Cercomacra nigricans. 
Cercomacra nigricans, Scl. P. Z.S. 1858, p. 245*; Cat. Birds Brit. Mus. xv. p. 2677; Scl. & Salv. 
P. Z. S. 1879, p. 526°. _ 
Pyriglena maculicaudis, Scl. P. Z. S. 1858, p. 268 (?)*; Lawr. Ann. Lye. N. Y. vii. p. 825°; Sel. 
 & Salv. P.Z. S. 1864, p. 356°. 
Cercomacra maculicaudis, Scl. Cat. Birds Brit. Mus. xv. p. 2687. 
Atra, plaga dorsali celata, campterio alari, tectricum alarum et rectricum apicibus albis: rostro et pedibus 
nigris. Long. tota 6-0, ale 2°6, caude rectr. med. 2°8, rectr. lat. 1-9, rostri a rictu 0-9, tarsi 1-0. (Deser. 
maris ex Paraiso, Panama. Mus. nostr.) 
Q grisea, gutturis et pectoris plumis medialiter albis nigricanti-griseo marginatis. (Descr. femins ex Santa 
Rita, Ecuador. Mus. nostr.) 
Hab. Panama, Lion Hill (M*Leannan® 6), Paraiso Station (//ughes). -—— CoLomBIA ?; 
Ecuapor; VENEZUELA?; TRinrpap ? 
We are unable to distinguish between adult males of C. nigricans and C. maculi- 
caudis, and the type of the former seems to us to be a young bird. Mr. Sclater does 
not separate the skins in the British Museum geographically, for he places birds from 
Panama and Qolombia under both names, 
