550 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
CHLOROSTILBON MAUGAI (Audebert and Vieillot). 
PORTO RICAN EMERALD. 
Adult male.—Above rather dark metallic green. or bronze-green; 
tail uniform glossy blue-black, or black glossed with steel blue; 
remiges very dark brownish slate or dusky, faintly glossed with 
violaceous; under parts wholly brilliant metallic golden green, the 
chest slightly purer green (less golden); femoral and lumbar tufts 
white; maxilla dull black; mandible pale brownish (pink or reddish 
in life?), with blackish tip; iris dark brown; feet dusky; length 
(skins), 84-95 (87); wing, 45-50 (48.6); tail, 32.5-38.5 (35.8), middle 
rectrices, 20-23 (21.5); culmen, 13-14 (13.6). 
Adult female—Above metallic green or bronze-green, including 
middle pair of rectrices, these sometimes more bronzy; second pair 
of rectrices bronze-green with terminal portion black, the third pair 
similar, but the black more extensive and a small pale gray spot at 
apex of inner web; fourth pair with more than basal half bronze- 
green (duller than on middle pair), crossed by a broad subterminal 
area of blue-black and with a large terminal spot of pale gray; fifth 
(outermost) pair similar, but with terminal gray spot still larger and 
the basal area gray faintly glossed with bronze-green; remiges very 
dark brownish slate or dusky, faintly glossed with violaceous; loral 
and suborbital regions dusky; malar region and under parts very 
pale gray or grayish white, the sides and flanks mostly metallic 
green, with feathers deep brownish gray beneath surface; femoarl 
and lumbar tufts white; bill dull black, the base of mandible usually 
slightly more brownish; iris and feet as in adult male; length (skins), 
77-88 (83); wing, 44.5-48 (45.7); tail, 26-32.5 (28.9), middle rectrices, 
22-25 (23.6); culmen, 14-16 (14.8).° 
Immature male.—Similar to the adult male, but green of under 
parts darker and much duller, with brilliant green feathers, indicat- 
ing the adult plumage, first appearing on lower throat; mandible 
mostly dusky. 
Porto Rico, Greater Antilles (Adjuntas; Mayaguéz; Lares; Ponce; 
El Yéinque; Utuado). 
Trochilus maugaeus AUDEBERT and VIEILLOT, Ois. Dorés, i, 1801, 71-79, 80, 93, 
pls. 37, 38 (Porto Rico; coll. Paris Mus.).—Temmincx, Cat. Syst. du Cab. 
d’Orn., 1807, 84.—Vizmort, Nouv. Dict. d’Hist. Nat., vii, 1817, 368. 
T[rochilus] maugzeus Virm.ot, Tabl. Enc. Méth., ii, 1822, 567. 
Ornismya maugaei Lesson, Hist. Nat. Ois.-Mouch., 1829, pp. xiv, 194, pls. 68, 69; 
Index Gen. and Synop. Troch., 1832, p. xxii. 
Trochilus maugei SUNDEVALL, fv. k. Vet.-Ak. Férh., 1869, 600. 
Sporadinus mauget GuNDLACH, Journ. fiir Orn., 1874, 312. 
[Sporadinus] maugeus BonaParTE, Rev. et Mag. de Zool., 1854, 255. 
Sporadinus maugaeus GUNDLACH, Journ. fiir Om., 1878, 160, 182 (crit.). 
@ Six specimens. 5 Ten specimens. 
