BIRDS OF NORTH AND MIDDLE AMERICA. 523 
KEY TO THE SPECIES OF POLYERATA.® 
a. Bill shorter (culmen 17-19.5 in male, 18.5-20 in female); middle rectrices purplish 
bronze; adult male with violet or violet-blue throat-patch broader and more vio- 
laceous. (Eastern Nicaragua, Costa Rica, and Panamé, to western Ecuadér.) 
Polyerata amabilis (p. 523). 
aa. Bill longer (culmen 21-23 in male, 21-24 in female); middle rectrices greenish 
bronze adult male with throat-patch narrower and more bluish. (Western 
Costa Rica and Panam4.)...........--.0---.-02---- Polyerata decora (p. 525). 
POLYERATA AMABILIS (Gould). 
LOVELY HUMMING BIRD. 
Adult male.—Forehead and crown brilliant metallic green (yel- 
lowish emerald green); occiput, sides of head and neck, hindneck, 
back, scapulars, and wing-coverts metallic bronze-green, changing to 
bronze, greenish bronze, or purplish bronze on rump, the upper tail- 
coverts deep bronze or (usually) purplish bronze; middle pair of rec- 
trices dark metallic bronze or (usually) purplish bronze; rest of tail 
black, glossed with bluish, the rectrices next to middle pair dark 
bronze or purplish bronze basally, the exterior ones usually narrowly 
margined at tip with pale grayish; remiges dark brownish slate or 
dusky, glossed with violaceous; chin and upper throat opaque black 
viewed from in front, rather dull metallic green or bronze-green, the 
feathers margined with dusky, when viewed from behind; lower 
throat and upper chest bright metallic violet-blue, this area purer 
blue (sometimes greenish blue) exteriorly; lower chest rather dull 
metallic green or bluish green, the feathers margined with pale gray 
or grayish white (especially along median line), the sides and flanks 
similar, but the green more bronzy; abdomen and median portion of 
breast pale brownish gray; under tail-coverts dusky gray, faintly 
glossed with bronze, and margined (more or less broadly) with pale 
gray or grayish white; femoral tufts white; maxilla dull black, man- 
dible pale brownish or dull whitish (pink or reddish in life), the tip 
dusky; iris dark brown; feet grayish brown or dusky; length (skins), 
@ Tn addition to the two species (or subspecies) found within the geographic limits 
of this work, three additional ones have been described, but they are all autoptically 
unknown to me. : 
- (1) Polyerata rosenbergi Boucard.—Polyerata rosenbergi Boucard, Genera Hum. 
Birds, Dec., 1895, 399 (Rio Dagua, n. w. Colombia; coll. A. Boucard).—Polyerata 
rosenbergiit Boucard, The Hum. Bird, v, 1895, 6 (Rio Dagua; crit.).—A[gyréria] rosen- 
bergi Hartert, Novit. Zool., v, 1898, 517 (crit.); Das Tierreich, Troch., 1900, 48. 
(2) Polyerata reini Berlepsch.—Polyerata reinit Berlepsch, Orn. Monatsber., April, 
1897, 58 (w. Ecuadér; coll. Count von Berlepsch). 
(3) Polyerata cyaneotincta Gounelle.—Polyerata cyaneotincta Gounelle, Rev. Frang. 
d’Orn., no. 2, June 7, 1909, 17 (Colombia; coll. E. Gounelle). 
