BIRDS 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. Wing 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 grayish medially, greenish laterally, the lateral rectrices tipped 
with gray. 
Range.—Nicaragua to Venezuela and Ecuadér. (Six species.) 
KEY TO THE SPECIES OF CHALYBURA. 
a. Under parts (except under tail-coverts) metallic green or blue. (Adult males.) 
b. Under tail-coverts white. 
c. Mandible wholly black. 
d. Under parts metallic green. (Panam4 to Colombia and Venezuela.) 
Chalybura buffonii, adult male (p. 388). 
dd. Under parts metallic blue. (Colombia.) 
Chalybura ceeruleogaster, 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. (Panam4 and northwestern Co- 
lom bia) asada scdusscruee ss Chalybura urochrysa, adult male (p. 390). 
dd. Under parts tinged with blue. 
e. Throat and chest bluish green, abdomen green. (Panam4.) 
Chalybura isaure, adult male (p. 391). 
@ Trochilus (Glaucis?) cxruleogaster Gould, Proc. Zool. Soc. Lond., 1847, 96 (locality 
unknown).—[Lampornis] caeruleigaster Bonaparte, Consp. Av., i, 1850, 72.—Hypu- 
roptila cxruleogaster Gould, Mon. Troch., pt. vii, May, 1854 (vol. ii), pl. 91—Chaly- 
bura cxruleogaster Gould, Introd. Troch., oct. ed., 1861, 72.—C[halybura] caeruleogaster 
Hartert, Das Tierreich, Troch., ii, 1900, 92.—[Hylocharis. 3. Chalybura] caerulei- 
veniris Reichenbach, Aufz. der Colibr., 1854, 10.—[ Agyrtria. 6. Chalybura] caerulei- 
ventris Reichenbach, Troch. Enum., 1855, 7, pl. 767, figs. 4775, 4776.—C[halybura] 
caerulewventris 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. 
