Carriker : List of the Birds of Costa Rica. 679 



Corapipo leucorrhoa altera Hellmayr, Bull. Brit. Orn., Club, XVI, no. cxxiv 

 (Carrillo, May 8, 1906 [Underwood] ; Tring Museum). — Ridgway, Birds 

 N. and Mid. Amer., IV, 1907. 755. part (Panama and Costa Rica, and eastern 

 Nicaragua. — Costa Rica: Angostura, Turrialba, Turcurriqui, Cervantes, 

 Naranjo, Carrillo, Guapiles, Barranca, Bonilla, La Candelaria, Jimenez, 

 Buena Vista, La Concepcion de Jimenez). 



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



(Basulto). 

 Bangs Collection : Carrillo, La Vijagua, Cariblanco de Sarapiqui 



(Underwood). 

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



(Carriker & Crawford); Guacimo, Carrillo, El Hogar (Carriker). 



Twenty-nine skins. 



When Mr. Hellmayr described this bird he made it a subspecies of 

 C. leucorrhoa of Panama, giving as the distinguishing character the 

 difference in the wing-formula. This difference is very constant, with 

 no apparent intergradation, and in my judgment forms a specific rather 

 than subspecific character. To strengthen this supposition I discovered 

 that the birds of this species from southwestern Costa Rica were very 

 distinct from those of the Caribbean slope, in the color-pattern of the 

 throat, and with no intergradation between the two. I have therefore 

 raised Hellmayr's subspecies to specific rank, and made the new bird 

 a subspecies of it, the two having the same wing formula. 1 



C. a. altera is confined to the Caribbean slope, and the extreme 

 northwestern Pacific slope in Costa Rica, the continental divide being 

 so low at that point that it has crossed over in small numbers. It is 

 a bird of the humid forest, scarcely ever taken below 800 feet altitude, 

 and running upwards to at least 3,000 feet. 



428. Corapipo altera albibarbis subsp. nov. 



Pipra leucorrhoa Lawrence, Ann. Lye. N. Y., IX, 1868, 116, part (Guaitil 

 [F. Carmiol]). — Frantzius, Jour, fur Orn., 1869, 309 (San Mateo and Pa- 

 caca). — Zeledon, An. Mus. Nac. de C. R., I, 1887, 118, part (Pozo Azu 



1 Since writing the above, I have had the opportunity of examining five males of 

 Corapipo leucorrhoa from northwestern Colombia, which when compared with 

 specimens from eastern Costa Rica further strengthen the supposition that they 

 are specifically distinct. The Colombian birds are decidedly metallic blue on the 

 lower parts, especially on the sides of the body, where the blue is almost as intense 

 as on the upper parts; also the color-pattern of the white area of the throat is 

 slightly different, the lower edge being slightly convex, while in C. a. altera it is con- 

 cave. The wing-pattern is the same as given by Mr. Hellmayr for the southern 

 bird. 



