HEMICHELIDON. 431 



d". Most of the plumage not blue. 



e'. General color bright yellow or olive-green, the under parts at least, 

 yellow or greenish yellow. 

 /^ Bill greatly flattened, width at base nearly equal to bill from 

 nostril; rictal bristles strong, much longer than bill from nostril; 



breast and abdomen bright yellow Culicicapa (p. 472) 



/'-. Rictal bristles weak, shorter than bill from nostril; width of bill 

 at base much less than bill from nostril. 

 (f. Under parts pale yellow; upper parts earthy brown. 



Gerygone (p. 447) 

 g". Under parts greenish, or else white streaked with pale yellow; 



upper parts olive-gieen ^. Cryptolopha (p. 473) 



e-. General color neither yellow, olive-green, nor greenish yellow. 



f. Tail relatively longer, three to three and one-half times the tarsus. 

 g^. Throat and breast orange-buff or blue, never white. 



Cyornis (p. 436) 

 r/-. Throat and breast white, never buff nor blue. 



Rhinomyias ( p. 467 ) 

 /-. Tail relatively shorter, equal to about two and one-half times the 



tarsus Muscicapula (p. 441) 



c\ Tail equal to or longer than wing, sometimes very much longer. 



d}. Without a distinct fleshy eye-wattle and without an elongated nuchal 

 crest, 

 e*. Rictal bristles very strong and conspicuous, the longest equal to bill 

 from base; plumage of cro\vn not soft and velvety. 



Ehipidura (p. 456) 



eF. Rictal bristles few, small and inconspicuous, the longest less than 



culmen from base; plumage of head soft and velvety; color mostly 



bright blue, never chestnut-brown Hypothymis (p. 451) 



(P. With a distinct fleshy eye-wattle; and with either a full or a long 

 nuchal crest, 

 e^ Plumage mostly blue, or else reddish chestnut, never black. 



f-. Much smaller; wing less than 80 mm.; feathers of crown scale-like; 

 occipital crest-feathers long and slender; plumage bright blue. 



Cyanomyias (p. 455) 

 /^. Much larger; wing more than 90 mm.; feathers of crown not scale- 

 like; occipital crest full but not greatly lengthened. 



Xeocephus (p. 461) 



e". Plumage of adult male black and white; central tail-feathers very 



long; in no age of either sex is the plumage either largely blue or 



chestnut; wing, about 90 mm Terpsiphone (p. 465) 



Genus HEMICHELIDON Hodgson 1845. 



Bill veiy broad at base, slightly compressed toward the tip which is 

 pointed; bill from nostril a little more than half the length of tarsus; 

 wings long and pointed, when folded reaching at least half wa}'^ to tip 

 of tail; first primary short and small, not longer tlian tarsus; second 

 primary slightly shorter than fourth, tlie latter nearly as long as third. 

 Sexes similar; plumage mostly brown, gray, or ferruginous. 



