750 Annals of the Carnegie Museum. 



Family SYLVIID^. 



529. Polioptila superciliaris Lawrence. 



Polioptila superciliaris Lawrence, Ann. Lye. N. Y., VII, 1861, 304, 322 (Lion 

 Hill, Panama R. R.; coll. G. N. Lawrence); IX, 1868, 92 (Angostura, Atiro, 

 Guaitil [J. Carmiol]). 



Polioptila bilineata (not Culicivota bilineata Bonaparte ?) Salvin and Godman, 

 Biol. Centr.-Am., Aves, I, 1879, 52, part (Costa Rican references). — Nut- 

 ting, Proc. U. S. Nat. Mus., V, 1882, 387 (La Palma de Nicoya). — Ridgway, 

 Proc. U. S. Nat. Mus., V, 1882, 387 (critical). — Sharpe, Cat. Birds Brit. 

 Mus., X, 1885, 452 (Turrialba [Arce], Puntarenas [O. Salvin]). — Zeledon, 

 An. Mus. Nac. de C. R., I, 1887, 105 (Angostura). — Cherrie, Expl. Zool. en 

 C. R., 1891-2, 1893, 3 (Boruca, Terraba, and Buenos Aires). — Underwood, 

 Ibis, 1896, 432 (Miravalles; footnote by O. Salvin). 



Polioptila superciliaiis superciliaris Ridgway, Birds N. and Mid. Amer., Ill, 

 1904 (Isthmus of Panama to Guatemala). — Bangs, Auk, XXIV, 1907, 

 304 (Boruca, El Pozo, Paso Real, and Barranca de Terraba [Underwood.]) 



Polioptila superciliaris magna Ridgway, Proc. Biol. Soc. Wash., XVI, 1903, 

 no (Cartago, Costa Rica; coll. U. S. Nat. Mus.); Birds N. and Mid. Amer., 

 Ill, 1904, 728 (highlands of Costa Rica: Cartago). 



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



Alfaro), Pozo Azul de Pirris (Zeledon). 

 Bangs Collection: Bolson, Tenorio, Coralillo, El General, and Buenos 



Aires de Terraba, Cerro de Santa Maria (Underwood). 

 C. H. Lankester Collection: Miravalles. 

 Carnegie Museum: Pozo Azul de Pirris, Bagaces, Miravalles, El Pozo de 



Terraba, Boruca, Buenos Aires, Guacimo, Guapiles, ElHogar (Carriker). 



Seventeen skins. 



Nearly all skins of P. s. superciliaris which I have seen from the Carib- 

 bean slope of Costa Rica are slightly different from those of the Pacific, 

 in that they are slightly larger and darker. These differences, are, how- 

 ever, not constant enough to admit of the separation of the eastern bird 

 as a subspecies. I have examined the type of Mr. Ridgway 's P. super- 

 ciliaris magna, and I believe it to be only an unusually large and dark- 

 colored bird of P. s. superciliaris. Its measurements are scarcely greater 

 than those of some specimens of typical superciliaris from the Pacific 

 coast. It may be that with additional material from the eastern slope, 

 those birds will prove to be separable from the form found on the western 

 coast, in which case they will bear the name magna, which Mr. Ridgway 

 gave to the bird from Cartago, and the range of which he gives as the 

 highlands. 



At present we may say that the bird ranges over the whole of Costa 



