680 Annals of the Carnegie Museum. 



de Pirris and Guaitil). — Sclater, Cat. Birds Brit. Mas., XIV, 1888, 301, 

 part (no specimen from region occupied by this race). — Salvin and Godman, 

 Biol. Centr.-Am., Aves, II, 1890, 111, patt (Costa Rican references). — 

 Cherrie, Expl. Zool. en C. R., 1890-1, 1893, 36 (Palmar and Boruca). 

 Corapipo leucorrhoa altera Ridgway, Birds N. and Mid. Amer., IV, 1907, 755, 

 part (Guaitil). — Bangs, Auk, XXIV, 1907, 303 (Boruca, Paso Real [Under- 

 wood]). 



U. S. Nat. Mus. Collection: Guaitil (F. Carmiol). 

 Bangs Collection: El General and Buenos Aires de Terraba (Under- 

 wood). 

 Carnegie Museum: Guaitil, Boruca (Carriker). Four skins. 



Type, No. 11,273, Carnegie Museum; adult d", Guaitil, Costa 

 Rica, May 4, 1902 ; M. A. Carriker, Jr. 



Similar to Corapipo altera altera (Hellmayr), except that the white 

 on the throat is more restricted medially, and extends around farther 

 on the sides of the neck. 



In C. altera altera the posterior border of the white patch on the 

 throat is nearly straight or slightly concave, and the distance from the 

 tip of the bill to its posterior margin averages about 20 mm., while in 

 the new form the posterior margin has the shape of an inverted V 

 (A), with the distance from the tip of the bill to the apex of the A 

 only 12 mm., giving it a very decided " mustache " appearance. 



Two immature males have the same color-pattern as the adults. 



The females differ from C. a. altera in being slightly more oliva- 

 ceous-green above. Seven adult and two immature males and 

 numerous females of the new form were examined and compared with 

 a large series of C. a. altera. 



In Costa Rica this new form is confined to the southwestern Pacific 

 slope region, probably from the Rio Grande de Tarcoles southward, 

 and from near sea-level up to about 3,000 feet in small numbers. It 

 is nowhere so abundant as is its eastern representative, C. a. altera, 

 in some parts of the Caribbean slope. This form extends down the 

 Pacific slope as far as Divala, and the Volcan de Chiriqui, Panama, 

 specimens from those localities, collected by W. W. Brown, in the 

 collection of Mr. Bangs, being identical with Costa Rican birds. 



429. Pipra pipra anthracina Ridgway. 



Pipra leucocilla (not of Linnaeus) Sclater, Cat. Birds Brit. Mus., XIV, 1888, 

 297, part (no Costa Rican record). — Salvin and Godman, Biol. Centr.-Am., 

 Aves, II, 1890, no, part (no Costa Rican record). — Cherrie, Proc. U. S. 

 Nat. Mus., XIV, 1891, 536 (description of female from Costa Rica). 



