

HEMICHELIDON. 431 



d 2 . Most of the plumage not blue. 



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



yellow or greenish yellow. 



f 1 . 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) 



f. Rictal bristles weak, shorter than bill from nostril; width of bill 



at base much less than bill from nostril. 

 g l . 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-green Cryptolopha (p. 473) 



e 2 . General color neither yellow, olive-green, nor greenish yellow. 



f 1 . Tail relatively longer, three to three and one-half times the tarsus. 

 g' 1 . Throat and breast orange-buff or blue, never white. 



Cyornis (p. 436) 

 g 2 . Throat and breast white, never buff nor blue. 



Rhinomyias (p. 467) 

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



tarsus Muscicapula (p. 441) 



c 1 . Tail equal to or longer than wing, sometimes very much longer. 



d 1 . Without a distinct fleshy eye-wattle and without an elongated nuchal 



crest. 



e 1 . Rictal bristles very strong and conspicuous, the longest equal to bill 

 from base; plumage of crown not soft and velvety. 



Khipidura (p. 456) 



e 2 . 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) 



d 2 . With a distinct fleshy eye-wattle; and with either a full or a long 



nuchal crest. 

 e 1 . Plumage mostly blue, or else reddish chestnut, never black. 



f 1 . Much smaller; wing less than 80 mm.; feathers of crown scale-like; 

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



Cyanomyias ( p. 455 ) 



f 2 . Much larger; Wing more than 90 mm.; feathers of crown not scale- 

 like; occipital crest full but not greatly lengthened. 



Xeocephus (p. 461) 



e 2 . 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 very 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 way to tip 

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

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

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



