412 BIRDS OF THE REPUBLIC OF PANAMA PART 2 



of those from western Chiriqui, but this I regard as individual 

 variation. 



Beyond Chiriqui the typical form of the orange-bellied trogon 

 ranges to central Costa Rica. Birds from the northern part of that 

 country have the color of the posterior under surface much redder 

 orange, so that they have been described by Bangs as a separate 

 race, T. a. underwoodi. 



The relationship of these yellow-to-orange birds to Trogon col- 

 laris puella, with which they are sympatric in part at least of their 

 range, is uncertain. Salvin and Godman (Biol. Centr.-Amer., Aves, 

 vol. 2, 1896, p. 493) wrote that "we have little doubt that it is 

 only an aberrant form of T. puella," and so listed it in their account. 

 Ogilvie Grant (Cat. Birds Brit. Mus., vol. 17, 1892, p. 455) in- 

 cluded aurantiiventris as distinct in his review of the kinds of trogons, 

 but added that "It is very doubtful if this species is really distinct 

 from T. puella or merely a colour-variety." Bangs (Proc. New 

 England Zool. Club, vol. 3, 1902, p. 32), in his description of col- 

 lections made at Boquete by W. W. Brown, Jr., wrote regarding 

 this matter that "Mr. Brown had splendid opportunities of observing 

 the birds in life and is convinced that they are distinct species; he 

 told me that whenever he saw a pair together, always it was two 

 red-bellied or two yellow-bellied birds" and never a mixed pair. The 

 close similarity of the two is especially evident with older, faded 

 museum specimens. The question of relationship is one that needs 

 careful, detailed studies of the birds in life. In view of the uncertainty 

 from present information the aurantiiventris group is treated here as 

 a distinct species. 



TROGON RUFUS TENELLUS Cabanis: Graceful Trogon, 

 Trogon Gracioso 



Trogon tencllus Cabanis, Journ. f. Orn., vol. 10, May 1862, p. 173. (Costa Rica.) 



Size small; breast and abdomen yellow; edge of eyelids blue; 

 outer tail feathers white, heavily barred with black; males with 

 breast metallic green; female with breast brown, and central tail 

 feathers cinnamon. 



Description. — Length 235-260 mm. Tarsus feathered for upper 

 half, lower end bare. Adult male, crown, back, lesser wing coverts, 

 and rump metallic green ; upper tail coverts usually somewhat bluish 

 green; central rectrices bluish green to greenish blue, tipped broadly 

 with black ; two adjacent pairs with outer web similar, inner web 

 black ; three outer pairs black, tipped broadly with white, with the 



