614 Annals of the Carnegie Museum. 



349. Gymnopithys bicolor olivascens (Ridgway). 



Pithys bicolor Lawrence, Ann. Lye. N. Y., IX, 1868, 109 (Angostura [J. Car- 

 miol]). — Frantzius, Jour, fiir Orn., 1869, 306 (Costa Rica). — Boucard, 

 P. Z. S., 1878, 62 (San Carlos). — Zeledon, An. Mus. Nac. de C. R., I, 1887, 

 115 (Navarro de Cartago). — Sclater, Cat. Birds Brit. Mus., XV, 1890, 

 296 (Valsa [Carmiol]). 



Pithys bicolor olivascens Ridgway, Proc. U. S. Nat. Mus., XIV, 1891, 460 (Santa 

 Ana, Honduras). 



Gymnopithys olivascens Salvin and Godman, Biol. Centr.-Am., Aves, II, 1892, 

 222 (Costa Rican references). — Cherrie, Expl. Zool. en C. R., 1890-1, 

 1893, 42 (Boruca). 



Gymnopithys bicolor olivascens Bangs, Auk, XXIV, 1907, 296 (Boruca and El 

 Pozo de Terraba [Underwood]). 



U. S. Nat. Musem : Jimenez and San Carlos (Alfaro). 



Bangs Collection : El General de Terraba, La Vijagua and Pozo Azul 



de Pirris (Underwood). 

 C. H. Lankester Collection : La Florida. 

 Fleming Collection : Cariblanco de Sarapiqui (Underwood). 

 Carnegie Museum : Guapiles and Volcan de Turrialba, 2,000 feet 



(Carriker & Crawford); Cuabre, Guacimo, Rio Sicsola, El Hogar, 



Paso Real de Terraba (Carriker). Ten skins. 



Birds from the Pacific slope are slightly paler than Caribbean birds, 

 especially on the flanks and abdomen, being less ruddy-brown. The 

 difference is, however, too slight to be of importance. This species 

 has a wide range in Costa Rica, covering the whole of the Caribbean 

 and Pacific lowlands (except in Guanacaste) up to about 2,000 feet. 

 It is exclusively an inhabitant of the heavy forest, is both terrestrial 

 and arboreal, and is very fond of feeding on the common migratory 

 ant of that country, when it is usually to be seen in company with 

 Myrmeciza, Phcenosf ictus, and Formicarius, as well as several species 

 of Dendrocolaptine birds. As a rule it is rather shy, skulking off 

 quietly when disturbed. I have almost always seen it in small flocks 

 of from four to eight. It would seem that the conspicuously white 

 throat and breast would cause the birds to be easily seen, but it is 

 just the contrary, giving the same result as white underparts in a 

 mammal and rendering them much less conspicuous than any of the 

 other species having the same habits. 



350. Myrmeciza exsul Sclater. 



Myrmeciza exsul Sclater, P. Z. S., 1858, 540 (Panama [Delattre]). 

 Myrmeciza immaculata Lawrence, Ann. Lye. N. Y., IX, 1868, 109 (Pacuare 



