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. 
f'. 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°. Rietal bristles weak, shorter than bill from nostril; width of bill 
at base much less than bill from nostril. 
g’. 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-preens iio ea 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) 
g°. Throat and breast white, never buff nor blue. 
Rhinomyias (p. 467) 
f°. Tail relatively shorter, equal to about two and one-half times the 
LUT S ere see A a FS al dt ee a Muscicapula (p. 441) 
ce. Tail equal to or longer than wing, sometimes very much longer. 
ad, 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 crown not soft and velvety. 
Rhipidura (p. 456) 
e*. 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*, 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) 
f’. 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 wmmt..2:---1..:..-..... 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. 
