rusty brown or buffy), white at base of interscapulars more restricted, and feathers of chest (at least lateral portions) narrowly margined terminally with black.
Young male (nestling). — Above wholly dull black, with very indistinct narrow vermiculations of rusty brown on tips of some of the feathers; throat and chest dull grayish, broken by broad bars of black (most distinct on chest) and more narrowly barred with light buffy brown; sides, flanks, and under tail-coverts nearly uniform dull black, but showing very indistinct vermiculations of light brown, especially the under tail-coverts; breast and abdomen mostly white, or grayish white, broken by broad subterminal bars of black, the tip of each feather, narrowly, pale buffy brownish.[1]
Southern Mexico, in States of Vera Cruz (Orizaba; Santecomapám; Playa Vicente; Omealca; Buena Vista; San Andres Túxtla) and Tabasco (Teapa), and southward through Guatemala (Choctúm; Chiséc; Cobán; sources of Rio de la Pasión), Honduras (Omoa; San Pedro; San Pedro Sula; Céiba; Julian), Nicaragua (Greytown; Los Sábalos; Rio Escondido; San Emilis), Costa Rica (Tucurríqui; Jiménez; Las Trojas; Pacuare; Pozo Azúl de Pirrís; El Pozo de Térraba; Pozo del Rio Grande; Boruca; Paso Reál; Bolsón; El Hogár; Rio Sícsola; Guácimo; Barranca de Puntarenas; Lagarto; El Generál; Sipúrio), Panamá (Davíd; Mina de Chorcha; Divala; Agua Dulce; Lion Hill; Panamá; Sabana de Panamá), and north- western Colombia (Rio Lima; Rio Barratoro; Turbo) to Ecuadór (Guayaquíl; Babahoyo; Santa Rita; Sarayacu; Chimbo; Vinces; Foreste del Rio Peripa).[2]
The very large series of Mexican and Central American birds examined in this connection shows very clearly the absence of anything like corellation between geographic distribution and the coloration of the under tail-coverts, and, therefore, in the absence of other characters (that I can discern) I am forced to recognize a single form only.
- Thamnophilus transandeanus Sclater, Proc. Zool. Soc. Lond., xxxiii, April 11, 1855, 18 (Guayaquíl, w. Ecuadór; coll. Brit. Mus.); 1858, 210 (monogr.); 1860, 278 (Babahoyo, w. Ecuadór), 294 (Esmeraldas, w. Ecuadór); Edinb. Philos. Journ., new ser., i, 1855, 233; Cat. Am. Birds, 1862, 172 (Babahoyo, w. Ecuadór); Cat. Birds Brit. Mus., xv, 1890, 185 (Tuciuríqui, Costa Rica; Mina de Chorcha, Verágua; Panamá; Babahoyo, Santa Rita, Guayaquíl, and Sarayacu, Ecuadór; Remédios, prov. Antioquía, Colombia). — Cassin, Proc. Ac. Nat. Sci. Philad., 1860, 188 (Turbo, Colombia). — Lawrence, Ann. Lyc. N. Y., vii, 1862, 293 (Lion Hill, Panamá). — Sclater and Salvin, Proc.
- ↑ Described from no. 28866, Carnegie Museum; Boruca, Costa Rica, Aug. 7, 1907; M. A. Carriker, jr. (Sex given as female, but almost certainly an error.)
- ↑ I have not seen a specimen from Ecuadór, and therefore can not be sure that they are quite identical with those from Central America. Neither have I examined specimens from the vicinity of Bogotá or the State of Antioquía, Colombia, which have been separated by Menegaux and Hellmayr as Thamnophilus transandeanus granadensis.
