Carriker : List of the Birds of Costa Rica. 637 



Rica [Carmiol]). — Salvin and Godman, Biol. Centr.-Am., Aves, II, 1891, 

 152 (Costa Rican references). 

 Acrorchilns Ridgway, Proc. Biol. Soc. Wash., XXII, 1909, 71 (gen. nov.; 

 type, Synallaxis erythrops Sclater). 



U. S. Nat. Museum : Guayabo (Ridgway and Zeledon), El Copey, 



La Lagunaria, and Santa Maria de Dota (Basulto), La Estrella de 



Cartago (Alfaro), Jimenez (Verrill). 

 Bangs Collection : Azahar de Cartago and Escazu (Underwood). 

 Fleming Collection : La Hondura (Underwood). 

 Carnegie Museum: La Hondura and Juan Vinas (Car.iker). Four 



skins. 



The name of Synallaxis rufigenis Lawrence was given to an im- 

 mature specimen of what was then called Synallaxis erythrops Sclater. 

 However, the Costa Rican bird proves to be distinct from erythrops, 

 and must accordingly be called A. erythrops rufigenis. I have skins 

 of this species in the immature plumage, without a trace of chestnut 

 on the pileum, and one in the transition stage, showing the new 

 chestnut feathers growing out, which proves conclusively that the 

 name rufigenis of Lawrence was based on an immature bird. 



The species inhabits only the highlands, but occasionally straggles 

 down on the Caribbean slope to 2,000 and even 1,000 feet. It is 

 most abundant in the humid forests of the Dota Mountains and on the 

 upper Caribbean slope at about 3,000 to 4,000 feet. It is found only 

 in the heavy forest, but is fond of low vine-covered trees, and is fre- 

 quently seen in the company of other Dendrocolaptine species and 

 even tanagers and finches. 



371. Pseudocolaptes lawrencii Ridgway. 



Pseudocolaptes boissoneauti Boucard, P. Z. S., 1878, 59 (Navarro). 

 Pseudocolaptes lawrencii Ridgway, Proc. U. S. Nat. Mus., I, 1878, 253 (La Palma 



and Navarro; type from La Palma [Zeledon]). — Sclater, Cat. Birds Brit. 



Mus., XV, 1890, 79 (Veragua and Costa Rica). — Salvin and Godman, Biol. 



Centr.-Am., Aves, II, 1891, 153 (Costa Rican references). 

 Pseudocolaptes costaricensis Boucard, Bull. Soc. Zool. Fr., V, 1880, 230 



(Costa Rica). 



U. S. Nat. Museum : El Rey and Las Vueltas de Dota (Basulto), El 



Roble de Irazu (Cherrie). 

 Bangs Collection : Volcan de Irazu and Escazu (Underwood). 

 Carnegie Museum : Escazu, Volcan de Turrialba, Ujurras de Terraba 



(Carriker). Seven skins. 



