304 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
ee. Frontal feathering not extending as far forward as that of chin; exposed 
culmen shorter than tail, or else (Anthoscenus, part) the bill much stouter 
and not at all recurved terminally. 
J. Exposed culmen nearly to quite as long as tail; a white spot or streak 
on center of rump.......-..-..-.20-.eeee econ Anthoscenus (p. 344). 
Jf. Exposed culmen much shorter than tail; no white on center of rump. 
g. Shafts of outer primaries with a more or less distinct median ridge on 
basal half (or more), or else the shaft conspicuously enlarged and 
bent in middle portion. 
h. Adult males with shafts of outer primaries conspicuously enlarged 
and bent in middle portion; bill relatively broader terminally 
and narrower basally (the lateral outlines more nearly parallel). 
i. Tail graduated, more than two-thirds as long as wing. 
Pampa (p. 353). 
uw. Tail truncate or slightly rounded, not more (usually less) than 
two-thirds as long as wing........-..- Campylopterus (p. 356). 
hh. Adult males with shaft of outer primary not conspicuously thick- 
ened nor bent; bill relatively narrower terminally, broader 
basally (narrowly wedge-shaped in vertical profile). 
Pheeochroa (p. 362). 
gg. Shafts of outer primaries without trace of median ridge, and never 
enlarged nor bent in middle portion. 
h. Base of maxilla more denuded, the frontal feathering not extending 
as far as middle of nasal operculum (the latter almost wholly 
exposed). 
i. Tail emarginate or forked in adult males, emarginate or double- 
rounded in females and young. 
j. Under parts brownish gray in both sexes, and upper parts 
much duller in color......--...-..------ Pheoptila (p. 366). 
jj. Adult males metallic green or green and blue below, the upper 
parts much brighter in color.........-.. Cynanthus (p. 368). 
u&. Tail truncate or very slightly rounded or double-rounded. 
j. Wing three times as long as exposed culmen; adult males with 
a broad black auricular and white postocular stripe. 
Basilinna (p. 377). 
jj. Wing less than three times as long as exposed culmen; adult 
males without black or white on sides of head. 
Hylocharis (p. 384). 
hh. Base of maxilla less denuded, the frontal feathering extending 
forward to or beyond middle of nasal operculum (the latter with 
at least the upper basal portion concealed). 
i. Under tail-coverts all decomposed, plume-like. 
j. Larger (wing 62-72 mm.); tarsus naked; no white on tail. 
Chalybura (p. 386). 
jj. Smaller (wing 45-60 mm.); tarsus feathered; tail partly white; 
k. Maxillary tomium distinctly (but minutely) serrate terminally. 
secondaries partly rufous; bill longer (from base of nasal 
operculum one-fourth as long as wing). 
i. Outermost (tenth) primary much longer than ninth; adult 
males with under parts green...... Eupherusa (p. 393). 
Wl. Outermost (tenth) primary not longer than ninth; adult 
male with under parts black...... Callipharus (p. 399). 
kk. Maxillary tomium not serrate terminally; secondaries 
without rufous; bill shorter (from nasal operculum less 
than one-fourth as long as wing)......... Elvira (p. 401). 
