BIEDS OF NORTH AND MIDDLE AMERICA. 401 



Eupherusa nigriventris Lawrence, Proc. Ac. Nat. Sci. Phila., 1867, 232 (Costa 

 Rica; coll. U. S. Nat. Mus.); Ann. Lye. N. Y., ix, 1868, 127 (Costa Rica).— 

 Frantzius, Joum. fiir Om., 1869, 317 (Costa Rica).— Salvin, Proc. Zool. 

 Soc. Lond., 1870, 210 (Cordillera del Chucu, Veragua; descr. female). — 

 MuLSANT and Verreaux, Hist. Nat. Ois.-Mouch., i, livr. 4, 1874, 270, 

 pi. 23 (Costa Rica); iv, livr. 3, 1878, 179 (Cordillera del Chucu; descr. 

 female).— Salvin and Godman, Biol. Centr.-Am., Aves, ii, 1892, pi. 57, 

 figs. 3, 4. 



[Euphrerusa] nigriventris Mulsant, Ann. Soc. Linn. Lyon, xxii, 1876, 205; Cat. 

 Ois.-Mouch, 1875, 6. 



[Eupherusa] nigriventris Simon, Cat. Troch., 1897, 21. 



CaUipharus nigriventris Elliot, Classif. and Synop. Troch., 1879, 211. — Zeledon, 

 Cat. Aves de Costa Rica, 1882, 21; Anal. Mus. Nac. Costa Rica, i, 1887, 122 

 (Naranjo de Cartago, Costa Rica). — Sharpe, in Gould's Suppl. Troch., 1887, 

 pi. 54.— Salvin, Cat. Birds Brit. Mus., xvi, 1892, 67 (Cordillera del Chucu 

 and Calobre, Veragua; Costa Rica). — Salvin and Godman, Biol. Centr.-Am., 

 Aves, ii, 1892, 270 (Cervantes and Peorsnada, Costa Rica, etc.). — Boucard, 

 The Hum. Bu-d, ii, 1892, 81 (Verdgua); Gen. Hum. Birds, 1894, 171 (Naranjo, 

 Costa Rica; Veragua). 



[Polytmus] nigriventris Gray, Hand-list, i, 1869, 133, no. 1702. 



[Thaumatias] nigriventris Sclater and Salvin, Nom. Av. Neotr., 1873, 92. 



E[lvira] nigriventris Hartert, Das Tierreich, Troch., 1900, 90 (monogr.). 



Elvira nigriventris Bangs, Proc. New Engl. Zool. Club, iii, 1902, 29 (Volcan de 

 Chiriqui, 6,000-7,000 ft.).— Carriker, Ann. Carnegie Mus., vi, 1910, 534 

 (Caribbean slope, Costa Rica).^ — Ferry, Pub. 146, Field Mus. N. H., cm. 

 ser., i, no. 6, 1910, 263 (Coliblanco, Costa Rica). 



[Elvira] nigriventris Sharpe, Hand-list, ii, 1900, 116. 



Genus ELVIRA Mulsant and Verreaux. 



Elvira Mulsant and Verreaux, Classif. Troch., 1865, 32. (Type, Trochilus 



(Thaumatias) chiotiura Gould.) 

 Lawrendus (not Lawrenda Ridgway, 1886) Boucard, Gen. Hum. Birds (in 



Humming Bird, iv, pt. 3), sig. s, Sept., 1894, 173. (Type, Eupherusa cuprei- 



ceps Lawrence.) 



Small Trochilid£e (length about 75 mm.) closely resembling Euphe- 

 rusa, but with maxillary tomium entirely smooth," the bill relatively 

 smaller (rather shorter than head), tail double-rounded or emarginate 

 and secondaries green and dusky, instead of cinnamon-rufous. 



Bill rather shorter than head, nearly terete, straight {E. chionura) 

 or distinctly decurved {E. cupreicejjs) ; culmen rounded except basally, 

 where contracted into a distinct ridge; tomia smooth;'* mandible mth 

 lateral median groove indistinct. Nasal operculum rather narrow, 

 tumid, mostly unfeathered, the frontal feathering extending on each 

 side of culmen to about the middle of nasal operculi. Tarsus feath- 

 ered; middle and inner toes about equal in length, the outer slightly 

 shorter, the hallux slightly shorter than outer toe. Wing decidedly 

 more than three times as long as exposed culmen, the outermost 



a Apparently, however, sometimes there are, when a magnifying glass is used, 

 faint indications of serrations. 



81255°— Bull. 50—11 26 



