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. 

 /. Exposed culmen nearly to quite as long as tail; a white spot or streak 



on center of rump Anthoscenus (p. 344). 



ff. 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 i^ortion; 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). 

 a. 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). 



Phaeochroa (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 Phaeoptila (p. 366). 



jj. Adult males metallic green or green and blue below, the upper 



parts much brighter in color Cynanthus (p. 368). 



ii. 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). 

 Jih. 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). 



II. Outermost (tenth) primary not longer Ihau ninth; adult 



male with under parts black Callipharus (p. 399). 



hl\ Maxillary tomium not serrate terminally; secondaries 

 without rufous; bill shorter (from nasal operculum less 

 than one-fourth as long as wing) Elvira (p. 401). 



