44 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



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

 (5.6); tarsus, 16.5-18.3 (17.8); middle toe, 11.7-12.7 (11.9).^ 



Immature female. — Entirely green above, including- head and neck, 

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

 b}^ more or loss exposed buti'v whitish, this forming a subterminal 

 spot or })ar to each feather, the middle portion of feathers of chest 

 more grayish, with a darker grayish l)ar between the light gray and 

 the green tip; abdomen and 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; Sa vanilla 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). 



Aglaia gyrola (not Tanagra gyrola Linnaeus) Lafresnaye and D'Orbigny, Mag. 



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

 Tanagra gyrola (not of Linnaeus) D'Orbigny, Voy. Amer. Merid., Ois., 1839, 272. 

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



Fauna Peruana, Aves, 1847, 202. 

 Aglaia penumna (not Tanagra peruviana Desmarest) Swainson, Auini. in 



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

 C\_alliste\ cyanovevtrh (not Tanagra cyanoventris Vieillot) Gray, Gen. Birds, ii, 



1844, 366. 



' Nine specimens. 



Specimens from different localities average as follows: 



Locality. 



MALES. 



Four adult males from Costa Rica 



Three adult males from Veragua and Panama 



Five adult males from Colombia (Bogota) 



Throe adult males from eastern Ecuador 



KEMALE.S. 



Two adult females from Costa Rica 



Two adult females from Veragua and Chiriqui 



Four adult females from eastern Ecuador 



One adult female from Peru 



Wing. 



80 

 75.7 

 77. .T 

 72.9 



74.9 

 73.2 

 72. (> 

 69.6 



Tail. 



Exposed 

 culmen. 



.52. 8 

 51.1 

 51. S 



48. 5 



49.8 

 48. S 

 50.3 

 47. S 



11.4 

 10.9 

 10.2 

 10.4 



10.7 

 10.4 

 10.4 

 10.2 



Middle 

 toe. 



12.2 

 12.7 

 11.9 

 11.2 



12.4 

 12.4 

 12. 2 

 12.2 



Adult males from Ecuador and Colom])ia ai)pear to have the yellow nuchal half- 

 collar much more distinct than those from Panama, Veragua, 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. 



