384 Annals of the Carnegie Museum. 



U. S. Nat. Museum : Guayabo (Ridgway & Zeledon). 



Ac. Nat. Sci. Phila. : Miravalles (Underwood). 



C. H. Lankester Collection : Cariblanco de Sarapiqui. 



Carnegie Museum: Pozo Azul, Juan Vinas, Cuabre (Carriker). Five 



skins. 



A young male (Pozo Azul, June) has almost the exact plumage of 

 the adult, although the bird itself is still quite small, the measurements 

 as follows: length, 393 mm.; wing, 143 mm.; tail, 168 mm. Birds 

 from various sections of the country show little or no sign of variation. 

 It has practically the same range as the preceding species, through the 

 whole of Costa Rica up to an altitude of perhaps not more than 5,000 

 feet, but being in greatest abundance at lower altitudes. Unlike the 

 larger Cracidae, they prefer the dense thickets of low, vine-covered 

 jungle, patches of wild cane, and thick second-growth. They are very 

 noisy when disturbed by man or animals, or when they find something 

 unusual. I once heard them making a fearful din in a small patch of 

 second-growth jungle, and upon carefully working my way inside, 

 found a flock of about a dozen of them running frantically backward 

 and forward along the limbs of a small tree, in the center of which 

 hung a sloth {Bradypus castaneiceps). The sloth was watching them 

 with open mouth, turning his head about, but apparently not greatly 

 disturbed. The nest is built in a low tree or in the midst of a clump 

 of vines. A nest was found on the Rio Sicsola, Oct. 6, 1904, placed 

 in a large fork of a tree, about eight feet from the ground, and resting 

 on a mat of vines, while the tree was growing in the midst of a patch 

 of wild cane beside a lagoon. The female was incubating three eggs, 

 which were creamy-white, the shell filled with fine punctures, making 

 it very rugose. Eggs average 54 X 40 mm. 



11. Chamaepetes unicolor Salvin. 



(Native name "Pava Negra.") 



ChaM<zpetes unicolor SALVIN, Proc. Zool. Soc. Lond., 1867, 159 (Veragua). — 

 Lawrence, Ann. Lye. N. Y., IX, 1868, 139 (La Palma [Frantzius], Rancho 

 Redondo [Zeledon]). — Frantzius, Jour, fiir Orn., 1869, 372 (La Palma). 



— Sclater and Salvin, Proc. Zool. Soc. Lond., 1870, 531 (Costa Rica 

 fCarmiol]). — Boucard, Proc. Zool. Soc. Lond., 1878, 42 (Volcan Irazii). 



— Zeled6n, Cat. Aves de C. R. 1882; An. Mus. Nac. de C. R., 1887, 

 128 (Rancho Redondo). — Ogilvie-Grant, Cat. Birds Brit. Mus., XXII, 

 1893, 522 (San Jose [Frantzius], Irazu [Rogers]). — Salvin and Godman, 

 Biol. Centr.-Am., Aves, III, 278 (Costa Rican references). 



