Carriker : List of the Birds of Costa Rica. 763 



Henicorhina prostheleuca piltieri Ridgway, Birds N. and Mid. Amer., Ill, 1904, 

 part (Panama and Costa Rica: Angostura, Turrialba, Tucurriqui, Jimenez, 

 Siquirris, San Carlos, Orosi, Talamanca). 



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

 way), San Carlos (Alfaro), Juan Vinas (Underwood), Revantazon 

 (Carranza), Jimenez (Verrill). 

 Bangs Collection: Tenorio, Cerro de Santa Maria, Juan Vinas, La Vijagua, 



Carrillo (Underwood). 

 Carnegie Museum: Guapiles (Carriker & Crawford), Juan Vinas, Car- 

 rillo, Rio Sicsola, Cuabre, Miravalles, El Hogar (Carriker). Thirty- 

 seven skins. 



After carefully comparing a large series of Costa Rican birds of this 

 species with skins from Honduras and Mexico, I find that all birds from 

 northern and eastern Costa Rica are inseparable from true prostheleuca, 

 and that the southern race, H. p. pittieri (Cherrie), is restricted to the 

 extreme southwestern portion of the country, practically the Terraba 

 Valley, whence came the type of the subspecies. 



I have therefore placed all Costa Rican references under //. p. pros- 

 theleuca, except those referring to birds from the southwestern portion of 

 the country. 



The range of this form in Costa Rica covers the whole of the Caribbean 

 lowlands and the slopes up to about 3,000 feet, also the Pacific slope from 

 Nicaragua south to the Gulf of Nicoya, at least. It is an inhabitant of 

 the heavy forest, keeping in the thick and tangled underbrush near the 

 ground, and is very shy. The species is one of the most beautiful songsters 

 of the country, some individuals developing a song which is truly remark- 

 able for its sweetness and rhythm, and the liquid purity and diversity of 

 its notes. Although the bird has a wide range it does not seem to be very 

 common in any locality, that is, there are not many individuals in any 

 one place. They are almost invariably seen in pairs, and when disturbed, 

 show remarkable skill in skulking off without being seen by the observer. 



544. Henicorhina prostheleuca pittieri (Cherrie). 



Henicorhina pittieri Cherrie, Expl. Zool. en C. R., 1891-2, 1893, 8 (Boruca, 

 Dec. 16, 1891; coll. Mus. Nac. de Costa Rica; also Terraba [Cherrie]). 



Henicorhina leucosticta Salvin and Godman, Biol. Centr.-Am., I, 1879, 79, part. 



Henicorhina prostheleuca Sharpe, Cat. Birds Brit. Mus., VI, 1881, 286, part. 



Henicorhina prostheleuca pittieri Ridgway, Birds N. and Mid. Amer., Ill, 1904, 

 612, part (Costa Rica to Isthmus of Panama; — Costa Rica: Terraba and 

 Boruca). — Bangs, Auk, XXIV, 1907, 305 (Boruca, seventeen specimens 

 [Underwood]). 



