670 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
conspicuous crest or neck-tufts or ruffs (sometimes both), and with 
outer web of ninth primary abruptly narrowed (almost obliterated) 
terminally. 
Bill shorter than head, stout, nearly terete (broad and depressed 
basally in ZL. adorabilis); culmen rounded terminally, narrowly 
ridged (for a greater or less distance) basally; tomia smooth; man- 
dible with the usual lateral median groove or sulcus indistinct 
or obsolete. Nasal operculuin narrow, almost rudimentary, hidden 
by appressed frontal feathering, which anteriorly extends nearly to 
(sometimes considerably beyond) anterior end of nostrils, forming 
a single broadly rounded or very faintly emarginate antia on base of 
culmen. Tarsus naked; lateral toes about equal in length, slightly 
but distinctly shorter than middle toe. Wing more than three to 
about four times as long as exposed culmen, the outermost (tenth) 
primary longest or equal to ninth, narrow but not acuminate, the 
ninth primary in adult males with outer web abruptly excised or 
narrowed (almost obliterated) for about terminal third or fourth. 
Tail in adult male about three-fifths to a little more than two-thirds 
as long as wing, double-rounded, the outermost rectrices sometimes 
longer, sometimes shorter, than middle pair—in females and young 
about half as long as wing, rounded, the rectrices broadly rounded 
at tip in both sexes. 
Coloration.—Back, etc., metallic green, bronze-green, or bronze; a 
more or less distinct bar of white or buffy acrossrump. Adult males 
extremely variable in coloration of head, neck, and under parts but 
always with the chin and throat brilliant metallic green; the head 
often conspicuously crested, and frequently with a conspicuous tuft 
of elongated, usually spangled or otherwise brilliantly colored feathers 
springing from the auricular region; adult females without crest or 
tufts, the chin and throat whitish or buffy, sometimes spotted or 
flecked with dusky or bronzy. 
Range.—Southern Mexico to Cayenne, southern Brazil, Bolivia, 
and Peru. (About ten species.) 
KEY TO THE SPECIES OF LOPHORNITS. 
a. Head conspicuously crested or tufted; rectrices (except middle pair) wholly 
cinnamon-rufous or merely edged with dusky. (Adult males.) 
b. No elongated auricular tuft, nor white patch on crown; forehead not coppery; 
no distinct white patch on chest. 
c. Whole pileum, including bushy crest, cinnamon-rufous; whole throat metallic 
green; under parts of body not spotted. (Central Costa Rica to northern 
Colombia.)......-....2.eeee ee eeeee Lophornis delattrei, adult male (p. 671). 
ce. Pileum dark metallic green, the slender crest blackish; lower throat velvety 
black; under parts of body spotted with bronze on a white ground. 
(Southeastern Mexico to Costa Rica.) 
Lophornis helenze, adult male (p. 678). 
