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 OP CAMPYLOPTERUS. 



a. Under parts metallic blue or violet (adult male), dusky (young male), or gray with 

 blue on throat (female); lateral rectricea broadly tipped with white. (South- 

 eastern Mexico to western Panamd.) 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 

 sometinjes 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, 7G.5-82.5 (79.5); tail, 52.5-60 (56.S); 

 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; 



<! Thirty-eight si)ecimens. 



