884 Annals of the Carnegie Museum. 



I have not seen the specimens upon which Mr. Ridgway bases the oc- 

 currence of this bird in Nicaragua and northern Costa Rica, but I find 

 that out of a considerable series collected in northern Costa Rica near the 

 Nicaraguan boundary, none could be referred to it, all being unmistakably 

 the southern race, even the birds from British Honduras being identical 

 with Costa Rican specimens of the following form. 



716. Cyanocompsa concreta cyanescens Ridgway. 



Cyanoloxia concreta Du Bus, Bull. Ac. Roy. Brux., XXII, 1855, 150. 



Guiraca cyanoides Zeledon, Cat. Aves de Costa Rica, 1882, 8. 



Guiraca concreta Lawrence, Ann. Lye. N. Y., IX, 1868, 102 (Turrialba and 

 Angostura [J. Carmiol]). — Salvin and Godman, Biol. Centr.-Am., Aves, I, 

 1885, 345 (C. R. [Frantzius], Turrialba, and Angostura [Carmiol]).— Frant- 

 zius, Jour, fiir Orn., 1869, 301 (Costa Rica).— Sharpe, Cat. Birds Brit. 

 Mus., XII, 1888, 74, part (Tempate and Tucurriqui [Arce]). — Cherrie, 

 Expl. Zool. Rio Naranjo, 1893, 14. — Underwood, Ibis, 1896, 436 (Mira- 

 valles). 



Guiraca cyanoides concreta Ridgway, Proc. U. S. Nat. Mus., V, Sept. 5, 1882, 

 392 (La Palma de Nicoya [Nutting]). — Zeledon, An. Mus. Nac. de C. R., 

 I, 1887, in (Jimenez, Pacuare, and Rio Sucio). — Cherrie, Expl. Zool. en 

 C. R., 1891-2, 1893, 28, (Boruca, Terraba, and Buenos Aires). 



Cyanocompsa concreta cyanescens Ridgway, Birds North and Mid. Amer., I, 

 1901, 597 (southern Honduras to western Ecuador). — Bangs, Auk, XXIV, 

 1907, 311 (Boruca, Paso Real, and El Pozo de Terraba [Underwood]). 



U. S. Nat. Museum: Bonilla (Ridgway and Zeledon) (Basulto), Pigres 



(Ridgway), Jimenez (Alfaro) (Verrill), Rio Sucio (Cooper), Buena Vista 



(Castro and Fernandez), Pozo del Pital (Cherrie). 

 Bangs Collection : Pozo Azul, Carrillo, Coralillo, Buenos Aires, La Vijagua, 



El General de Terraba (Underwood). 

 C. H. Lankester Collection: Guacimo. 

 Carnegie Museum: Guapiles, Rio Sicsola, Cuabre, El Hogar, Esparta; 



Coronado, Boruca, and El Pozo de Terraba; Pozo Azul de Pirris (Car- 



riker). Twenty-three skins. 



After a careful study of the large series of birds in the Carnegie Museum 

 and those belonging to Mr. Bangs, the conclusion is obvious that all Costa 

 Rican specimens of Cyanocompsa concreta must be referred to the southern 

 race, cyanescens, although not typical of that form. Even birds from 

 British Honduras have exactly the same coloration and the same slender 

 bill as those from Costa Rica, none of them having the dull blue color 

 and heavy bill of Mexican specimens. All specimens from the Terraba 

 Valley and some from farther north on the Pacific coast are almost, if not 



