404 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



[Euphenisa] chionura Simon, Cat. Troch., 1897, 21. 



[Polytmus] chionurus Gray, Hand-list, i, 1869, 129, no. 1637. 



Elvira chionura Mulsant and Verreaux, Hist. Nat. Ois.-Mouch., i, livr. 4, 

 1874, 266; iv, livr. 3, 1878, 179.— Elliot, Classif. and Synop. Troch., 1879, 

 210. — Zeledon, Cat. Aves de Costa Rica, 1882, 21; Anal. Mus. Nac. Costa 

 Rica, i, 1887, 122.— Salvin, Cat. Birds Brit. Mus., xvi, 1892, 74 (Costa 

 Rica; Chiriqul and Calovevora, Veragua). — Salvin and Godman, Biol. 

 Centr.-Am., Aves, ii, 1892, 273.— Boucard, The Hum. Bird, ii, 1892, 81 

 (Veragua); Gen. Hum. Birds, 1894, 172. — Bangs, Proc. New Engl. Zool. 

 Club, iii, 1902, 29 (Boquete and Volcan de Chiriqul, 4,000-7,700 ft.); Auk, 

 xxiv, 1907, 296 (Boruca, Costa Rica). — Carriker, Ann. Carnegie Mus., vi, 

 1910, 535 (Costa Rica). 



[Elvira] chionura Mulsant, Ann. Soc. Linn. Lyon, xxii, 1876, 205. — Sharpe, 

 Hand-list, ii, 1900, 116. 



E[lvira^ chionura Hartert, Das Tierreich, Troch., 1900, 90 (monogr.). 



Eupherusa niveicauda Lawrence, Ann. Lye. Nat. Hist. N. Y., viii, 1867, 134 

 (Dota, Costa Rica; coll. U. S. Nat. Mus.). 



ELVIRA CUPREICEPS (Lawrence). 



COPPERY-HEADED EMERALD. 



Similar to E. chionura, but bill distinctly decurved and adult 

 male with upper tail-coverts bright copper-bronze, pileum and 

 middle rectrices bronze instead of green, no white on abdomen, and 

 lateral rectrices tipped (less extensively) with light gray instead 

 of black. 



Adult male. — Pileum dull coppery bronze; liindneck, back, scapu- 

 lars, rump, and wing-coverts bronze-green; upper tail-coverts bright 

 coppery bronze; middle pair of rectrices bronze (much less coppery 

 than upper tail-coverts); four outer rectrices (on each side) pure 

 white, the three outer tipped wath pale gray, the fourth tipped (more 

 abruptljO with black; remiges dusky purplish brown, the inner 

 secondaries mostly bronze-green; under parts bright yellowish me- 

 tallic green, the under tail-coverts pure white, the anal tufts grayish 

 white; maxilla black; mandible pale (flesh color in life?), dusky 

 terminally; iris dark brown; feet grayish brown (in dried skins); 

 length (skins), 74-79 (77); mng, 46-51 (48.4); tail, 24-27 (25.4); 

 culmen, 13.5-15 (14.1).« 



Adult female. — Above metallic green (less bronzy than in adult 

 male), duller on pileum; upper tail-coverts and middle pair of 

 rectrices bright bronze (the former usually more coppery) ; four outer 

 rectrices white with a V-shaped subterminal bar of gray or dusky, 

 the fourtli tipped with black or black and gray and edged for ter- 

 minal half (more or less) with blackish; remiges as in adult male; 

 under parts dull white or grayish white, passing into pure white 

 posteriorly, the sides more or less (sometimes extensively)'' spotted 



a Ten specimens. 



^ Occasionally the green spotting extends across chest or breast. 



