Carriker : List of the Birds of Costa Rica. 897 



more, a number of birds have a more or less pronounced yellow edging 

 to the wing. These characters do not seem to be correlated with age or 

 sex, but are apparently purely individual." (W. E. C. Todd.) 



Very common throughout the higher parts of the country, ranging from 

 3,500 feet to timber-line, but most abundant at about 9,000 feet on the 

 volcanoes Irazu and Turrialba, where they are to be seen after the breeding 

 season in small flocks, hopping about on the ground, or in the shrubbery 

 of the forest, even venturing out into the edges of the pastures. They 

 were also quite abundant near the summits of the mountains in southern 

 Costa Rica. 



Two nests were found on the Volcan de Irazu at an altitude of about 

 9,000 feet, on April 14 and 16, 1902, containing one and two eggs 

 respectively, and both with incubation begun. The nests were built 

 entirely of dry bamboo leaves, lined with fine stems of grass, and placed 

 on sprays of bamboo from ten to fifteen feet above the ground in deep 

 thickly wooded ravines. Eggs pale bluish, thickly speckled, spotted, and 

 blotched with lilac and chestnut-brown, more heavily about the larger 

 end, forming a patch or wreath. Average measurements: 23.8X18.5 mm. 



733. Buarremon costaricensis Bangs. 



Buarremon assimilis Lawrence, Ann. Lye. N. Y., IX, 1868, 101 (Guaitil [J. 

 Carmiol]). — Frantzius, Jour, fiir Orn., 1869, 300. — Salvin, Ibis, 1874, 308 

 (crit.). — Sclater, Cat. Birds Brit. Mus., XI, 1886, 257 (Costa Rica). — 

 Zeledon, Cat. Aves de C. R., 1882, 8. — Salvin and Godman, Biol. Centr.- 

 Am., I, 1884, 318 (Guaitil). — Cherrie, Expl. Costa Rica, 1891-2, 26 (Boruca 

 and Buenos Aires de Terraba). — Ridgway, Birds of North and Mid. Am., I, 

 1 90 1, 468 (Costa Rica to Peru and Venezuela). 



Buarremon costaricensis Bangs, Auk, XXIV, 1907, 310 (Boruca, Barranca de 

 Terraba, and Lagarto de Terraba [Underwood]). 



U. S. Nat. Museum: Pozo Azul de Pirris. 



Bangs Collection: El General de Terraba (Underwood). 



Carnegie Museum: Boruca (Carriker). Six skins. 



"A female taken July 18 is just beginning the postjuvenal moult. The 

 juvenal plumage is brownish-olive above (as in B. assimilis), which color 

 also replaces the ashy head-markings of the adult, the pattern being dis- 

 tinctly indicated; underneath greenish-olive, obscurely streaked with 

 darker; mandible orange, with black base; maxilla black; iris hazel; 

 feet dark horn. Adults have the bill entirely black. The characters 

 distinguishing this species from Buarremon assimilis are obvious at a 

 glance, and apparently constant." (W. E. C. Todd.) 



