358 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
ated, as in Pampa) the rectrices are distinctly narrowed terminally. 
The bill, moreover, in all the species of the group (true Campylopterus) 
is straight, as in Pampa, though less broad and depressed basally. 
KEY TO THE SPECIES OF CAMPYLOPTERUS. 
a. Under parts metallic blue or violet (adult male), dusky (young male), or gray with 
blue on throat (female); lateral rectrices broadly tipped with white. (South- 
eastern Mexico to western Panam4.)...... Campylopterus hemileucurus (p. 358). 
aa. Under parts light cinnamon-rufous or vinaceous-cinnamon (in both sexes); lateral 
rectrices broadly tipped with light cinnamon-rufous. (Guatemala) 
Campylopterus rufus (p. 361). 
CAMPYLOPTERUS HEMILEUCURUS (Lichtenstein). 
DE LATTRE’S SABRE-WING. 
Adult male—Forehead and crown dusky, faintly glossed with 
bluish green; occiput, hindneck, upper back (at least partly), auricu- 
lar, suborbital, and malar regions, and under parts from chin to anal 
region (inclusive), bright metallic violet-blue to bluish violet, occa- 
sionally varying, in places, to more greenish blue, the feathers dusky 
or blackish subterminally, grayish basally; lower back mixed violet- 
blue and green or bluish green; scapulars, wing-coverts, rump, and 
upper tail-coverts metallic green or bluish green, the feathers of rump 
sometimes tipped with blue; tail bluish black, the middle pair of 
rectrices usually tinged with green, the three outermost (on each side) 
very broadly tipped with white, this on lateral pair occupying much 
more than terminal third; remiges dull blackish or dusky, faintly - 
glossed with purplish; under tail-coverts dull dark metallic green or 
(partly) greenish blue; conspicuous femoral tufts white or grayish 
white; bill black; iris dark brown; legs and feet dusky; length 
(skins), 136-154 (142); wing, 76.5-82.5 (79.5); tail, 52.5-60 (56.8); 
culmen, 26-31 (28.9).% 
Adult female——Above bright metallic green or bronze-green, much 
duller (sometimes dusky glossed with bronze) on forehead and crown, 
appearing more bluish green when viewed from in front, especially on 
upper tail-coverts; middle rectrices duller and more bluish green; 
lateral rectrices and remiges as in adult male, but former glossed with 
bluish green on basal portion of outer webs; under parts gray, paler 
on abdomen, glossed with metallic green laterally (especially on sides 
and flanks), the throat spotted with bright metallic blue or violet-blue, 
often forming a solid patch of this color; bill, etc., as in adult male; 
2 Thirty-eight specimens. 
