712 Annals of the Carnegie Museum. 



localities are noted for their excessive humidity, caused by fog and mist, 

 rather than actual rainfall. 



477. Pipromorpha semischistacea (Cherrie). 



Mionectes semischistacea Cherrie, Proc. U. S. Nat. Mus., XV, 1892, 27 (Guaya- 

 bal, Costa Rica, Feb. 24, 1891; type in coll. U. S. Nat. Mus.). 



Pipromorpha semischistacea Ridgway, Birds N. and Mid. Amer., IV, 1907, 458 

 (eastern Costa Rica, Guayabal, near Turrialba). 



This bird is known only from the single type specimen. It is a very 

 distinct form, yet has a very peculiar appearance, as though it might 

 possibly be a hybrid, which supposition is strengthened by the fact that 

 no more specimens of it have ever been taken. 



478. Pipromorpha assimilis dyscola (Bangs). 



Mionectes oleagineus Lawrence, Ann. Lye. N. Y., IX, 1868, in, part (Costa 

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

 1869, 397, part (Costa Rica). — Boucard, P. Z. S., 1878, 63 (San Mateo). — 

 Solater, Cat. Birds Brit. Mus., XIV, 1888, 112, part (Guaitil [Carmiol]). — 

 Salvin and Godman, Biol. Centr.-Am., Aves, II, 1888, 22, part (Costa 

 Rican references). — Underwood, Ibis, 1896, 438 (Miravalles). 



Mionectes assimilis (not of Sclater) Lawrence, Ann. Lye. N. Y., IX, 1868, 111, 

 part (Guaitil). — Frantzius, Jour, fur Orn., 1869, 307, part (Costa Rica). — 

 Zeledon, An. Mus. Nac. de C. R., I, 1887, 116 (Pozo Azul de Pirris, Las 

 Trojas, Monte Redondo). — Cherrie, Expl. Zool. en C. R., 1891-2, 1893, 

 31 (Palmar, Lagarto, Boruca, Terraba). 



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

 1888, 113, part (Guaitil). 



Mionectes assimilis dyscola Bangs, Auk, XVIII, 1901, 362 (Panama). 



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

 455. ■pwt (Nicaragua to Veragua; — Costa Rica: San Mateo, Guaitil, Volcan 

 de Miravalles, Pozo Azul de Pirris. Pozo Pital). — Bangs, Auk, XXIV, 

 1907, 300 (Boruca, Paso Real, El Pozo and Barranca de Terraba [Underwood]). 



Bangs Collection: Pozo Azul de Pirris, Buenos Aires, El General de Ter- 

 raba, Tenorio (Underwood). 

 C. H. Lankester Collection: Miravalles. 



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

 Boruca (Carriker). Twelve skins. 



The status of the species Pipromorpha assimilis in Costa Rica is a rather 

 peculiar one, representatives of both P. a. assimilis and dyscola being 

 found there, but neither are typical examples of the subspecies to which 

 they belong. All the birds from the Pacific slope are nearer to dyscola, 

 those from the Terraba Valley being almost typical, while from Guana- 



