336 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
Genus THRENETES Gould. 
Threnetes @ Gouup, Mon. Troch., pt. iv, Oct., 1852, pl. 13; Introd. Troch., oct. 
ed., 1861, 40. (Type, Trochilus leucurus Linnzus.) 
Dnophera > Hene, Journ. fiir Orn., 1863, 175, in text. (Type, Trochilus antonix 
Bourcier and Mulsant.) 
Medium-sized Trochilide (length about 110-120 mm.) with the 
long, rather stout, depressed and distinctly decurved bill less than 
twice as long as head, tail more than half as long as wing, graduated, 
with rectrices more or less subacuminate terminally, the rectrices 
(except middle pair) white or buff basally. : 
Bill rather stout, much broader than deep basally, distinctly 
(though not conspicuously) decurved, less than twice as long as 
head, the culmen distinctly ridged, at least basally, where con- 
stricted and elevated into a rather conspicuous narrow ridge; man- 
dible grooved laterally for basal half or more. Nostril narrow, slit- 
like, overhung by a broad, tumid, mostly unfeathered operculum, but 
frontal feathering extending, in a narrow line, nearly to its anterior 
end; unfeathered inter-ramal space long and broad. Tarsus naked, 
about as long as middle toe without claw, the latter about equal to 
inner toe, the outer toe slightly shorter; hallux slightly shorter than 
outer toe. Wing about twice as long (more or less) as exposed 
culmen, the outermost primary longest. Tail longer than exposed 
culmen, decidedly more than half as long as wing, graduated, with 
rectrices distinctly cuneate or subacuminate at tip or Gn 7’. cervi- 
nicauda) moderately rounded with rectrices broadly rounded ter- 
minally. 
Coloration.—Rather dull metallic bronze-green or bronze above, 
the rectrices (except middle pair) abruptly white for basal half (more 
or less), then blackish, the tip whitish, or (in 7’. cervinicauda) buff 
with or without dusky at tip; chin and upper throat black or dusky, 
lower throat buff or tawny, under parts of body dull grayish (chest 
dull metallic green in 7’. cervinicauda). Sexes nearly alike, but 
females duller in color. 
Range.—Guatemala to Guiana and Bolivia, mostly in lowlands. 
(Five species.) 
THRENETES RUCKERI (Bourcier). 
RUCKER’S HERMIT. 
Adults (sexes alike) Above metallic bronze-green or greenish 
bronze, duller on pileum, where feathers are narrowly margined with 
dusky and with a dusky shaft-streak; upper tail-coverts margined 
terminally with pale cinnamon or pale grayish buffy, this bordered 
anteriorly by a narrow curved line of dusky; middle pair of rectrices 
a “ @onuytic, a Mouner.”” 
b “Von dvogepéc (dunkel, finster).”’ (Heine.) 
