130 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



KEY TO THE SPECIES OF TACHYPHONUS. 



a. General color black. (Adult males.) 



b. With white on lesser and under wing-coverts, 

 c. Larger (wing more than 82.5) ; middle wing-coverts and part of lesser covert 

 area black. (Costa Kica to southern Brazil, Trinidad, and Tobago.) 



Taohyphonus rnfus, adult male (p. 130) 



cc. Smaller (wing less than 69.8); middle wing-coverts and all of lesser covert 



area white. 



d. Middle wing-coverts greatly developed, covering much more than basal 



half of greater coverts; crown without trace of central concealed spot of 



yellow. (Veragua to Bolivia, southwestern Brazil, Venezuela, and 



Trinidad) TachyphonuB luctuosns, adult male (p. 132) 



dd. Middle wing-coverts normally developed, covering not more than basal 



half of greater coverts; crown usually with more or less of a central 



patch of yellow or orange-rufous. 



e. Crown-patch small, concealed, yellow, sometimes wanting. (Costa Rica, 



to southeastern Honduras. ) . . .Tachyplioniis axillaris, adult male (p. 134) 



ee. Crown-patch large, conspicuous, exposed, orange-rufous. (Veragua, 



Chiriqui, and southwestern Costa Rica. ) 



Tachyphonus nitidissinms, adult male (p. 136) 

 66. Without white on wing-coverts (or elsewhere). (Costa Rica to Colombia; 



Ecuador?) Tachyphonus delattrii, adult male (p. 136) 



aa. General color rufous, yellowish olive, or brown. (Adult females and young.) 

 6. General color ruf escent ( deep cinnamon-rufous above, tawny-ochraceous below ) ; 

 wing more than 76.2. .Tachyplionus rufns, adult female and youngmale (p. 131) 

 66. General color not rufescent; wing not more than 69.8. 

 c. Above yellowish olive-green, beneath yellow.' 



d. Sides of head distinctly gray; chin and throat white. 



Tachyphonus luctuosus, adult female and young male (p. 133) 

 dd. Sides of head not distinctly, if at all, gray; chin and throat pale buffy. 

 e. Duller yellow below, especially across chest. 



Tachyphonus nitidissimus, adult female and young male (p. 136) 

 ee. Brighter yellow below. 



Tachyphonus axillaris, adult female and young male (pp. 134, 135) 

 cc. Above deep sooty brown, beneath similar but lighter. 



Tachyphonus delattrii, adult female and young male (p. 137) 



TACHYPHONUS RUFUS (Boddaert). 

 BOSDAERT'S TANAGER. 



Adult male. — Glossy bluish or violaceous black, the centers of +he 

 feathers (mostly concealed) lusterless black, the basal portion grayish; 

 remiges and rectrices black, without gloss; under wing-coverts, axil- 

 lars, and lesser wing-coverts (except those near bend of wing) white; 

 bill black, the basal half, or more, of mandible grayish; legs and feet 

 black or dusky brown; length (skins), 149.9-182.9 (172); wing, 83.3- 

 91.4 (87.4); tail, 75.2-86.4 (80.8); exposed culmen, 15.7-18.3 (17.3); 



^The series of specimens examined of the three allied forms, C. luciuosus, C. niti- 

 dissimus, and C. aocUlaris is very small, and I am therefore doubtful &S to the relia- 

 bility of the characters here given. 



