44 



BULLETIN 50, UNITED STATES KATIONAL MUSEUM. 



(48.8); exposed culmen, 9.7-10.9 (10.4); depth of bill at base, 5.1-5.8 

 (5.6); tarsus, 16.6-18.3 (17.8); middle toe, 11.7-12.7 (11.9).' 



Immature femalc—Entirelj green above, including head and neck, 

 the color duller than in the adult female; beneath pale green, broken 

 by more or less exposed buffy whitish, this forming a subterminal 

 spot or bar to each feather, the middle portion of feathers of chest 

 more grayish, with a darker grayish bar between the light gray and 

 the green tip; abdomen arid under tail-coverts yellowish white, tinged 

 with pale green. 



Immature male. — Similar to immature female, but green of head 

 interspersed with orange-chestnut feathers and abdomen largely pale 

 blue. 



Costa Rica (Guaitil; Turrialba; Barranca; Dota; Savanilla de Pirris; 

 Navarro; Cartago; San Marcos; Sarche de Alajuela, etc.) and south- 

 ward through Colombia and Ecuador to Peru (Chyavetas; Cosnipata; 

 Rio Javarri; Mapoto), western Bolivia (Mapiri) and upper Amazons 

 (Ega; Maribatanas). 



AgUia gyrola (not Tanagra gyrola Linnaeus) Lapresnaye and D'Orbigny, Mag. 



de Zool., 1837 (Synopsis Avium, i, p. 32). 

 Tanagra gyrola (not of Linnseus) D'Okbigny, Voy. Amer. M6rid., Ois., 1839, 272. 

 Callospiza gyrola Tschudi, Wiegmann's Archiv. fiir Naturg., 1844, 286 (Peru); 



Fauna Peruana, Aves, 1847, 202. 

 Aglaia peruviana (not Taiiagra peruviana Desmarest) Swainson, Anim. in 



Menag., 1838, 356 (Peru; coll. W. Hooker). 

 Clalliste] cyanoventris (not Tanagra cyanoventru Vieillot) Gray, Gen. Birds, ii, 



1844, 366. 



' Nine specimens. 



Specimens from different localities average as follows: 



Adult males from Ecuador and Colombia appear to have the yellow nuchal half- 

 collar much more distinct than those from Panama, Yeragua, and Costa Rica, wnile 

 those from eastern Ecuador are of rather a greener blue below than those from 

 Colombia and northward. It is possible the species may require subdivision, but a 

 much larger series of specimens will be necessary to determine the question. 



