214 FORMICARIIDZ. 
are males, and the female still remains unknown to us, though specimens of both 
sexes were obtained at Ropaybamba in Peru by Jelski, who shot them from a wandering 
band of birds as they searched the leaves at the ends of the branches of the trees ®. 
-T. callinota is the only species of its genus which has a plain black crown, a yellowish 
abdomen, and yellow edges to the wing. 
b'. Vibrisse obvie, acrotarsium scutellatum, planta integra. 
c", Rectrices decem. 
CERCOMACRA. 
Cercomacra, Sclater, P. Z. S. 1858, p. 244; Cat. Birds Brit. Mus. xv. p. 2638. 
A genus of about ten species, of which two only occur within our limits, both of 
them widely spread species on the southern continent—C. tyrannina extending its range 
to Southern Mexico, C. nigricans to the State of Panama. 
Cercomacra is a peculiar genus in several respects, the tail having the abnormal 
number of ten feathers. The bill is wide, and the rictal vibrisse clearly shown. The 
nostrils are round and open, the dense nasal feathers reaching to the posterior 1 margin 
of the nostrils. The tail is long and much rounded. 
1. Cercomacra tyrannina. 
Pyriglena tyrannina, Scl. P. Z. S. 1855, pp. 90', 147, t. 98°. 
Cercomacra tyrannina, Scl. P. Z. 8. 1859, pp. 55°, 383°; Cat. Birds Brit. Mus. xv. p. 265°; Scl. 
& Salv. Ibis, 1859, p. 119°; 1860, p. 36"; 1864, p. 356°; 1870, p. 837°; Salv. P. Z. 8. 
1867, p. 145"°; 1870, p. 195"; 1883, p. 424"; Lawr. Ann. Lyc. N.Y. ix. p. 109”; 
Boucard, P. Z. S. 1878, p. 61; Nutting, Pr. U.S. Nat. Mus. vi. pp. 886’, 405°°; Tacz. 
Orn. Pér. ii. p. 54°7; Zeledon, Ann. Mus. Nac. Costa Rica, 1887, p. 115 ™*. 
Hypocnemis schistacea, Lawr. Ann. Lye. N. Y. vii. p. 825 (nee Scl.) * 
Disythamnus rufiventris, Lawr. Ann. Lyc. N. Y. viil. p. 131 (cf. Salv. Ibis, 1874, p. 316) *°. 
Nigricanti-cinerea, humeris et tectricibus alarum marginibus albis, plaga dorsali celata alba: subtus pallidior, 
abdomine imo murino-brunneo tincto, subalaribus cinereis, remigibus interne albo marginatis; cauda 
nigricante, rectricibus externis vix albido stricte terminatis: rostro et pedibus nigris. Long. tota 5:5, 
alee 2:4, caudse rectr. med. 2°4, rectr. lat. 1:5, rostri a rictu 0°75, tarsi 0-9. (Descr. maris ex Teapa, 
Tabasco, Mexico. Mus. nostr.) ; 
© supra rufe-brunnea, plaga dorsali celata alba : subtus omnino rufa, gula pallidiore, subalaribus rufis, remi- 
gibus interne pallide cervino marginatis: rostro et pedibus corylinis, illius mandibula pallida, _ (Deser. 
feminz ex Chisec, Guatemala. Mus. nostr.) . 
3 juv. feming similis, sed supra obscurior et pectore plumis cinereis mixto. 
Hab. Mexico, Playa Vicente (Boucard*, M. Trujillo), Sochiapa (Trujillo) ; Britis 
Honpuras, Belize (Leyland*); GuateMata, Chisec, Choctum, Coban ¢, Yzabal 
(0. 8. & F.D.G.); Honpuras, San Pedro (G. WV. Whitely ®); NrcaraGua, Matagalpa 
(W. B. Richardson), Sucuya 15, Los Sabalos !6 (Nutting); Costa Rica, Tucurriqui 
