30 BULKETIN 50, UNITED STATES NATIONAL MUSEUM, 



rusty brown or biiffy), white at base of interscapulars more restricted, 

 and feathers of chest (at least lateral portions) narrowly margined 

 terminally with black. 



Young male (nestling) . — Above wholl}^ 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 imiform 

 dull black, but shoAving very indistinct vermiculations of light brown, 

 especially the under tail-coverts; breast and abdomen mostly white, 

 or grajdsh 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- 

 pam; Playa Vicente; Omealca; Buena Vista; San Andres Tuxtla) 

 and Tabasco (Teapa), and southward through Guatemala (Choctum; 

 Chisec; Coban; sources of Rio de la Pasion), Honduras (Omoa; San 

 Pedro; San Pedro Sula; Ceiba; Julian), Nicaragua (Grey town; Los 

 Sabalos; Rio Escondido; San Emilis), Costa Rica (Tucurriqui; 

 Jimenez; Las Trojas; Pacuare; Pozo Azul de Pirris; El Pozo de 

 Terraba; Pozo del Rio Grande; Boruca; Paso Real; Bolson; El 

 Hogar; Rio Sicsola; Guacimo; Barranca de Puntarenas; Lagarto; 

 El General; Sipiirio), Panama (David; Mina de Chorcha; Divala; 

 Agua Dulce; Lion Hill; Panama; Sabana de Panama), and north- 

 western Colombia (Rio Lima; Rio Barratoro; Turbo) to Ecuador 

 (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 Sclater, Proc. Zool. Soc. Lond., xxxiii, April 11, 



1855, 18 (Guayaqufl, w. Ecuador; coll. Brit. Mus.); 1858, 210 (monogr.); 



1860, 278 (Babahoyo, w. Ecuador), 294 (Esmeraldas, w. Ecuad6r); Edinb. 



Philos. Journ., new ser., i, 1855, 233; Cat. Am. Birds, 1862, 172 (Babahoyo, w. 



Ecuad6r); Cat. Birds Brit. Mus., xv, 1890, 185 (Tucurriqui, Costa Rica; 



Mina de Chorcha, Verdgua; Panamd; Babahoyo, Santa Rita, Guayaquil, and 



Sarayacu, Ecuad6r; Remedies, prov. Antioquia, Colombia). — Cassin, Proc. 



Ac. Nat. Sci. Philad., 1860, 188 (Turbo, Colombia). — Lawrence, Ann. Lye. 



N. Y., vii, 1862, 293 (Lion Hill, Panamd).— Sclater and Salvin, Proc. 



o 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.) 



t> I have not seen a specimen from Ecuador, 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 Bogotd or the State of Antioqufa, Colombia, which 

 have been separated by Menegaux and Hellmayr as Thamnophilus transandeanus 

 granadensis. 



