30 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
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 indis- 
tinct 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.* 
Southern Mexico, in States of Vera Cruz (Orizaba;. Santecoma- 
pim; Playa Vicente; Omealca; Buena Vista; San Andrés Taxtla) 
and Tabasco (Teapa), and southward through Guatemala (Chocttim; 
Chiséc; Coban; sources of Rio de la Pasién), Honduras (Omoa; San 
Pedro; San Pedro Sula; Céiba; Julian), Nicaragua (Greytown; Los 
Sabalos; Rio Escondido; San Emilis), Costa Rica (Tucurriqui; 
Jiménez; Las Trojas; Pacuare; Pozo Aztl de Pirris; El Pozo de 
Térraba; Pozo del Rio Grande; Boruca; Paso Real; Bolsén; El 
Hogar; Rio Sicsola; Guécimo; Barranca de Puntarenas; Lagarto; 
El General; Siptrio), Panamé (David; Mina de Chorcha; Divala; 
Agua Dulce; Lion Hill; Panama; Sabana de Panama), and north- 
western Colombia (Rio Lima; Rio Barratoro; Turbo) to Ecuadér 
(Guayaquil; Babahoyo; Santa Rita; Sarayacu; Chimbo; Vinces; 
Foreste del Rio Peripa).? 
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 ScuateR, Proc. Zool. Soc. Lond., xxxiii, April 11, 
1855, 18 (Guayaquil, w. Ecuadér; coll. Brit. Mus.); 1858, 210 (monogr.); 
1860, 278 (Babahoyo, w. Ecuadér), 294 (Esmeraldas, w. Ecuadér); Edinb. 
Philos. Journ., new ser., i, 1855, 233; Cat. Am. Birds, 1862, 172 (Babahoyo, w. 
Ecuadér); Cat. Birds Brit. Mus., xv, 1890, 185 (Tucurrfqui, Costa Rica; 
Mina de Chorcha, Ver4gua; Panam4; Babahoyo, Santa Rita, Guayaquil, and 
Sarayacu, Ecuadér; Remédios, prov. Antioquia, Colombia).—Cassin, Proc. 
Ac. Nat. Sci. Philad., 1860, 188 (Turbo, Colombia).—Lawrence, Ann. Lyc. 
N. Y., vii, 1862, 293 (Lion Hill, Panam4).—Sctater and Satvin, 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.) 
bI have not seen a specimen from Ecuadér, 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 Bogot4 or the State of Antioqufa, Colombia, which 
have been separated by Menegaux and Belcays as Thamnophilus transondeanus 
granadensis. 
