Carriker : List of the Birds of Costa Rica. 713 



caste they are less so. All the birds from the Caribbean are referable to 

 true assimilis. 



This is one of the most abundant of the woodland flycatchers found 

 in Costa Rica, inhabiting the Pacific slope from sea-level up to at least 

 3,500 feet (Guaitil). Its habits are more like a vireo than a true tyrant- 

 bird, while it is frequently found in company with Pachysylvia ochra- 

 ceiceps and some of the small arboreal Formicariidce. It is always seen 

 in the heavy forest, rather low down in the small trees and shrubbery, and 

 is usually alone when not in company with some of the above mentioned 

 birds. Although a common bird I have never found its nest. 



479. Pipromorpha assimilis assimilis (Sclater). 



Mionectes oleaginus (not Muscicapa oleaginea Liechtenstein) Sclater, P. Z. S., 

 1856, 296 (Cordova, Mexico). 



Mionectes oleagineus Lawrence, Ann. Lye. N. Y., IX, 1868, 111, pari (Costa 

 Rica "[Enrique Arce]; coll. O. Salvin,"). — Frantzius, Jour, fur Orn., 

 1869, 397, part (Costa Rica). — Sclater, Cat. Birds Brit. Mus., XIV, 1888, 

 112, part (Turrialba [Arce]). — Salvin and Godman, Biol. Centr.-Am., Aves, 

 II, 1888, 22, part (Costa Rican references). 



Mionectes assimilis Lawrence, Ann. Lye. N. Y., IX, 1868, in, part (Angos- 

 tura and Pacuare [J. Carmiol]). — Frantzius, Jour, fiir Orn., 1869, 307, 

 part (Costa Rica). 



{Mionectes oleagineus] a. subsp. assimilis Sclater, Cat. Birds Brit. Mus., XIV, 

 1888, 113, part (Turrialba [Arce]). 



[Pipromorpha] assimilis Heine and Reichenow, Nom. Mus. Hein., 1890, 141 

 (Cordova, Mexico). 



Pipromorpha assimilis dyscola Ridgway, Birds N. and Mid. Amer., IV, 1907, 

 455. part (Nicaragua to Vcagua; — Costa Rica: Angostura, Pacuarito, 

 Matina, Val, Guayabal, Tr.rialba, Pacuare, Bonilla, Jimenez). 



Pipromorpha assimilis assimilis Ridgway, Birds N. and Mid. Amer., IV, 1907, 

 454, part (Mexico to southern Honduras). — Bangs Proc. Biol. Soc. Wash., 

 XXII, 1909, 33 (northern Costa Rica; critical). 



U. S. Nat. Museum: Guayabo (Ridgway and Zeledon). 



Bangs Collection: Guayabal, La Vijagua, Carrillo, Matina (Underwood). 



Carnegie Museum: Guapiles (Carriker & Crawford), Cuabre, Rio Sic- 



sola, Carrillo, El Hogar, Peralta (Carriker). Eight skins. 



All the birds from the Caribbean slope of Costa Rica that I have been 

 able to examine are much nearer to typical assimilis than to dyscola, al- 

 though none are typical of the northern birds. Those from La Vijagua 

 are nearer to birds from British Honduras than any others on the eastern 

 slope of Costa Rica, but all are very noticeably distinct from birds from 

 the Pacific slope, especially those from Terraba. Guanacaste birds are 



