BIEDS OF NORTH AND MIDDLE AMERICA. 387 



ridge; terminal portion of both maxillary and mandibular tomia 

 minutely serrate; mandible with a longitudinal median groove, the 

 maxilla with more or less faint indication of a similar groove. Nasal 

 operculum moderately broad and convex, mostly nude, the frontal 

 feathering reaching to or beyond its middle portion, forming a short 

 antia or angle on each side of mesorhinium. Tarsus stout, naked; 

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

 the hallux shorter than outer toe; toes rather stout, with claws rela- 

 tively short but very acute. Wmg about three times as long as 

 exposed culmen, the outermost primary longest. Tail about two- 

 thirds as long as wing, emarginate, the rectrices broad, with rounded 

 or broadly subcuneate tip. 



Coloration. — Above metallic green, in some species changing into 

 dark bronze or copper-bronze on upper tail-coverts. Adult males 

 with under parts (except under tail-coverts) metallic green or blue, 

 the under tail-coverts white, or (in one species) dusky, the tail 

 plain blue-black, bronzy black, or bronzy; adult females with under 

 parts gra3dsh medially, greenish laterally, the lateral rectrices tipped 

 with gray. 



Range. — Nicaragua to Venezuela and Ecuador. (Six species.) 



KEY TO THE SPECIES OF CHALYBURA. 



a. Under parts (except under tail-coverts) metallic green or blue. {Adult vmles.) 

 b. Under tail-coverts white. 

 c. Mandible wholly black. 

 d. Under parts metallic green. (Panamd, to Colombia and Venezuela.) 



Chalybura buffonii, adult male (p. 388). 

 dd. Under parts metallic blue. (Colombia.) 



Chalybura caeruleogaster, adult male (extralimital).<^ 

 cc. Mandible pale colored (reddish or flesh colored in life) for at least basal half. 

 d. Under parts green, without blue tinge. (Panama and northwestenr Co- 

 lombia.) Chalybura urochrysa, adult male (p. 390). 



dd. Under parts tinged with blue. 



e. Throat and chest bluish green, abdomen green. (Panama.) 



Chalybura isaurae, adult male (p. 391). 



« Trochilus {Glands'^) cscruleogaster Gould, Proc. Zool. Soc. Lond., 1847, 96 (locality 

 unknown). — [Lamponiis] caendeigaster Bonaparte, Consp. Av., i, 1850, 72. — Hypu- 

 roptila cseruleogaster Gould, Mon. Troch., pt. vii, May, 1854 (vol. ii), pi. 91. — Chaly- 

 bura cseruleogaster Gould, Introd. Troch., oct. ed., 1861, 72. — C[halybura] caeruleogaster 

 Hartert, Das Tierreich, Troch., ii, 1900, 92. — [Hylocharis. d. Chalybura] cacrulei- 

 ventris Reichenbach, Aufz. der Colibr., 1854, 10. — [Agyrtria. 8. Chalybura] caerulei- 

 ventris Reichenbach, Troch. Enum., 1855, 7, pi. 767, figs. 4775, 4776. — C[halybura] 

 caeruleiventris Cabanis and Heine, Mus. Hein., iii, 1860, 20. — Lampornis coerulei- 

 ventris Mulsant and Verreaux, Hist. Nat. Ois.-Mouch., i, livr. 3, 1874, 168 (Andes of 

 Colombia). — Chalybura (Lampornis) coeruleiventris Mulsant and Verreaux, Hist. Nat. 

 Ois.-Mouch., iv, livr. 2, 1877, 156.^ — Chalybura cxruleiventris Elliot, Classif. and 

 Synop. Troch., 1879, 47. — Hypuroptila cxruleiventris Salvin, Cat. Birds Brit. Mus., 

 xvi, 1892, 88. 



