BIRDS OF NORTH AND MIDDLE AMERICA. 565 
crown bright metallic violet, chin and throat brilliant metallic green, 
remaining under parts dark metallic bronze-green or blackish. 
Adult females with pileum dull bronze-greenish or dusky, under 
parts grayish, lateral rectrices blackish subterminally and tipped 
with pale gray. 
Range.—Southwestern United States (near Mexican boundary) to 
Costa Rica, in higher mountains. (Two species.) 
KEY TO THE SPECIES OF EUGENES. 
a. Pileum metallic violet, throat metallic emerald green. (Adult males.) 
b. Chest velvety black; smaller: Wing 69.5-76 (73), culmen 25.5-31 (27.4). (Guate- 
mala to southern Arizona.).......-..--- Eugenes fulgens, adult male (p. 565). 
bb. Chest dull metallic green or bronze-green; larger: Wing 76-81 (77.8); culmen, 
29-33 (31). (Costa Rica and western Panamd..) 
Eugenes spectabilis, adult male (p. 568). 
aa. Pileum dull metallic greenish or dusky; throat dull brownish white or pale 
brownish gray, streaked or spotted with darker. (Adult females.) 
b. Smaller: Wing, 66.5-70.5 (68.7); culmen, 27-30.5 (29.1). 
Eugenes fulgens, adult female (p. 566). 
bb. Larger:. Wing, 68-74.5 (73.5); culmen, 35-7.5 (36.3). 
Eugenes spectabilis, adult female (p. 569). 
EUGENES FULGENS (Swainson). 
RIVOLI HUMMING BIRD. 
Adult male——Pileum rich metallic violet or royal purple, the 
forehead (at least anteriorly) blackish, usually glossed with green or 
bluish green; hindneck, sides of occiput, and auricular region velvety 
black in position a, metallic bronze, bronze-green, or golden green 
in position c; rest of upper parts metallic bronze, bronze-green, or 
golden green, including tail, the latter sometimes with rectrices pass- 
ing into pale grayish at tip; remiges dark brownish slate or dusky, 
faintly glossed with purple or purplish bronze; chin and throat 
brilliant metallic emerald green (more yellowish in position a, more 
bluish in position 6), this brilliant green area extending much farther 
backward laterally than medially; chest and upper breast velvety 
black in position a (bronze or bronze-green in position c), passing 
into dusky bronze or bronze-green on lower breast, this into grayish 
brown or sooty grayish on abdomen and flanks; femoral and anal tufts 
white; a small white postocular spot or streak (sometimes a whitish 
rictal streak. also); under tail-coverts light brownish gray (some- 
times glossed with bronze or bronze-green) margined (more or less 
distinctly) with whitish; bill dull black; iris dark brown; feet dusky; 
length (skins), 114-136 (125); wing, 69.5-76 (73); tail, 40.5-48 
(43.2); middle rectrices, 32.5-41 (86.5); culmen, 25.5-31 (27.4).¢ 
@ Thirty-one specimens. 
