BIRDS OF NORTH AND MIDDLE AMERICA. 565 



crown bright metallic violet, chiii 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. 



^a7i(7<'.— 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 jiale 

 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, 35-37.5 (36.3). 



Eugenes spectabilis, adult female (p. 569). 



EUGENES FULGENS (Swainson). 



RIVOLI HUMMING BIRD. 



Adult male. — Pileum rich metallic violet or ro3^al purple, the 

 forehead (at least anteriorly) blackish, usually glossed with green or 

 bluish green; hindneck, sides of occiput, and auricular region velvety 

 black hi 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 sometunes 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 wliite postocular spot or streak (sometimes a wliitish 

 rictal streak also); under tail-coverts Hght 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 (36.5); culmen, 25.5-31 (27.4).« 



« Thirty-one specimena. 



