116 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
strongly convex basally, nearly straight and ascending terminally. 
Nostril exposed, broadly oval, margined above by narrow membrane, 
posteriorly in contact with the short and very dense feathering of 
latero-frontal antie. Rictal bristles present but small; feathers of 
chin, malar anti, etc., short, without trace of terminal sete. Wing 
rather short but pointed, very concave beneath, the outer primaries 
rather strongly arcuate, the longer ones projecting decidedly beyond 
secondaries; sixth, seventh, or eighth primaries longest, the tenth 
(outermost) nearly three-fourths as long as the longest, the ninth 
decidedly longer than secondaries. Tail about three-fifths as long as 
wing, rounded (graduation less than distance from nostril to tip of 
maxilla), the rectrices (12) rather broad and firm, rounded terminally. 
Tarsus about two and a half times as long as bill from nostril, 
decidedly less than two-fifths as long as wing, distinctly scutellate, 
the plantar scutella quadrate, in two longitudinal series; middle toe, 
with claw, a little more than two-thirds as long as tarsus (longer 
than commissure); outer toe, without claw, reaching to about middle 
of subterminal phalanx of middle toe, the inner toe very slightly 
shorter; hallux much shorter than inner toe, slightly stouter; basal 
phalanx of middle toe united for more than half its length to outer 
toe, for less than half its length to inner toe; anterior claws: very 
short, relatively broad, slightly curved; claw of hallux slightly 
curved, nearly as long as its digit. Plumage compact, dense, that 
of rump and flanks not elongated nor lax; feathers of pileum not 
elongated. 
Coloration.—General color uniform brown or blackish (the head 
sometimes rufescent) above, dusky, grayish, or brownish below, some- 
times with chest rufescent or tawny, the under tail-coverts usually 
rufescent and throat black (sometimes margined posteriorly with a 
narrow band of cinnamon or chestnut); inner webs of remiges with 
basal portion (abruptly) buff, ochraceous, or tawny, the under wing- 
coverts similar but tipped with black; sexes alike; young similar 
but throat usually more or less variegated with white. 
Range.—Southern Mexico to western Ecuadér, Peru, Bolivia, 
southeastern Brazil, and Cayenne. (About fifteen species and 
subspecies. ) 
This genus is very distinct from any other, its nearest relative 
being the genus Chamexza Vigors,“ of South America, which differs 
in longer tail (more than two-thirds as long as wing), much greater 
development of plumage of lower back and rump, different char- 
acter of feathering of anterior portion of head, shorter and more 
depressed bill, variegated plumage, and other features. 
& See page 15. 
