594 Annals of the Carnegie Museum. 



birds should occur as well as occasionally a reversion to the type of 

 one form or the other, hence the occasional specimens nearly typical 

 of the northern or southern race which are taken in localities where 

 the opposite form is predominant. 



See notes on preceding species for range, etc. 



330. Picumnus olivaceus flavotinctus (Ridgway). 



Picumnus olivaceus Lafresnaye, Rev. Zool., 1845, 7, in (Bogota). — Cherrie, 



Expl. Zool. en C. R., 1890-1, 46 (Palmar, Boruca, Terraba, and Buenos Aires). 



— SALViNand Godman, Biol. Centr.-Am., Aves, II, 1895, 452, part (Honduras 



to Ecuador). 

 Picumnus granadensis Hargitt, Cat. Birds Brit. Mus., XVIII, 1890, 549, part 



(Chiriqui and Panama). 

 Picumnus flavotinctus Ridgway, Proc. U. S. Nat. Mus., XI, 1888, 543 (Pozo 



Aziil de Pirris, Sept., 1886 [Alfaro]). 

 Picumnus olivaceus flavotinctus Bangs, Auk, XXIV, 1907, 293 (Boruca, Paso 



Real and El Pozo de Terraba [Underwood]). 



U. S. Nat. Museum : Pozo Azul de Pirris (Alfaro). 



Bangs Collection :* El General de Terraba and Pozo Azul de Pirris 



(Underwood). 

 Carnegie Museum : Boruca and Buenos Aires de Terraba (Carriker). 



Twelve skins. 



This tiny little woodpecker is found in Costa Rica only in the ex- 

 treme southwestern portion of the Pacific lowlands, from Chiriqui 

 north to Pozo Azul de Pirris, but is quite abundant in some localities 

 in this area. It is usually found in low, vine-covered jungle, near 

 streams, rather than in the heavy virgin forest, although it is present 

 there also. It is always seen in pairs and is very tame and easily 



approached. 



Family PTEROPTOCHID^. 



332. Scytalopus argentifrons Ridgway. 



Scytalopus argentifrons Ridgway, Proc. U S. Nat. Mus., XIV, 1891, 475 (Vol- 

 can de Irazu, Costa Rica, April 23, 1891 [A. Alfaro] ; Coll. U. S. Nat. Mus.), 

 XVI, 1893, 613 (Volcan de Irazu). — Salvin and Godman, Biol. Centr.-Am., 

 Aves, II, 1892, 246 (reference to descr.). 



U. S. Nat. Museum: San Juan de Irazu (Ridgway and Alfaro) ; La 



Estrella de Cartago. 

 Bangs Collection : Volcan de Irazu (Underwood). 

 Fleming Collection : Volcan de Irazu and Carrillo (?) (Underwood). 

 Carnegie Museum : Volcan de Irazu, Ujurras de Terraba, Volcan de 



Turrialba (Carriker). Thirteen skins. 



