BIRDS OF NORTH AND MIDDLE AMERICA. _ 495 
white tips to lateral rectrices, the adult male with throat purple or 
purplish red instead of blue. 
Bill longer than head, depressed, very faintly decurved; culmen 
rounded except basally, where contracted into a narrow ridge; 
maxillary tomium very minutely serrate terminally; mandible with 
a lateral median groove. Nasal operculum rather narrow (its convex 
edge not descending to tomium), the posterior and inner portions 
covered by frontal feathering, which extends not quite to anterior 
end of the operculi, forming a very short point or antia on each side- 
of mesorhinium. Tarsus clothed with short feathers, except lower 
and extreme posterior portions; middle and outer toes nearly equal 
in length, the inner slightly shorter, the hallux about as long as inner 
toe. Wing about three times as long as exposed culmen, the outer- 
most primary longest. Tail about three-fifths as long as wing, 
rather deeply emarginate in adult male, slightly double-rounded in 
adult female, the rectrices firm, with rounded tip. 
Coloration.—Above metallic bronze-green or greenish bronze, duller 
on rump and upper tail-coverts, the tail blackish with tips of outer 
rectrices grayish; a dull whitish postocular streak and a similar (or 
buffy) rictal one, enclosing a broader auricular space of dusky; 
under parts brownish gray, adult males with feathers of throat 
broadly tipped with violet, purple or rosy. 
Range.—Highlands of Mexico and Guatemala. (Three species.) 
KEY TO THE SPECIES AND SUBSPECIES OF LAMPORNIS. 
. Throat metallic reddish purple, purple, violet, or violet-blue. (Adult males.) 
b. Throat purple to reddish or pinkish purple. (Lampornis amethystinus.) 
c. Throat reddish or pinkish purple, the feathers more broadly and distinctly 
margined with whitish; under parts paler; averaging larger, with longer 
bill (wing averaging 67.6, tail 42.3, culmen 21.5). (Southeastern Mexico.) 
Lampornis amethystinus amethystinus, adult male (p. 496). 
cc. Throat magenta purple, the feathers more narrowly and indistinctly margined 
with pale grayish; under parts darker; averaging smaller, with shorter bill. 
(Average measurements less than the above.) 
d. Dusky suborbital and auricular area less blackish and white postocular 
streak duller; averaging slightly larger (wing 68, tail 42.2, culmen 20). 
(Western Mexico.) 
Lampornis amethystinus brevirostris, adult male (p. 497). 
dd. Dusky suborbital and auricular area more blackish and postocular streak 
purer white; averaging slightly smaller (wing 65.2, tail 39.5, culmen 19.5). 
(Guatemala and Chiapas.) 
Lampornis amethystinus salvini, adult male (p. 498). 
bb. Throat violet or violet-blue. 
c. Throat violet; green of upper parts less bronzy. (Mountains of central 
GUCITOLO:) sete Seed eee Lampornis margarite, adult male (p. 499). 
cc. Throat violet-blue (royal purple or more bluish); green of upper parts more 
bronzy. (Mountains of eastern Guerrero to central Oaxaca.) 
Lampornis pringlei, adult male (p. 500), 
