678 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
long. In case two genera are recognized P. conversi and its allies 
would constitute a genus the earliest name for which appears to be 
Gouldomyia Bonaparte (1854). 
KEY TO THE SPECIES AND SUBSPECIES OF POPELAIRIA. 
a. Tail excessively forked, the lateral rectrices slenderly attenuate; no white on head 
nor anterior under parts. (Adult male.) 
b. Conspicuously crested; thighs cinnamon-rufous. (Colombia to Peru.) 
Popelairia popelairii, adult male (extralimital).¢ 
bb. Without crest; thighs not cinnamon-rufous. 
c. No white pectoral spot; rectrices blue-black or dark steel blue, the lateral ones 
more than 40 mm. long, their shafts white beneath. 
d. Flanks metallic green; only center of breast black, the feathers tipped with 
metallic green or blue; throat and chest metallic grass-green; lateral rec- 
trices strongly doubly curved. (Popelairia conversi.) 
e. Feathers of center of breast tipped with green; upper tail-coverts dark 
metallic green; wing 41-43.5 (42.6), tail 54.5-56.5 (55.2). (Central 
Colombia.)....Popelairia conversii conversii, adult male (extralimital).} 
ee. Feathers on center of breast tipped with bluish green or greenish blue; 
upper tail-coverts dark bronzy (at least in part); wing, 40-43 (41.4); 
tail, 46-61 (56.6). (Costa Rica to western Ecuador.) 
Popelairia conversii zequatorialis, adult male (p. 679). 
dd. Flanks pale brownish gray; whole breast uniform black; throat and chest 
metallic yellowish green; lateral rectrices curved outwardly only. 
Popelairia langsdorffi, adult male (extralimital).¢ 
@ Trochilus popelairti Du Bus, Esquis. Orn., livr. 2, 1846, pl. 6, and text (Peru; coll. 
Royal Mus. Belgium).—[Gouldia] popelairti Bonaparte, Consp. Av., i, 1850, 86.— 
Gouldia popelairii Gould, Mon. Troch., ili, 1854, pl. 127; Elliot, Classif. and Synop. 
Troch., 1879, 138.—P[rymnacantha] popelairei Cabanis and Heine, Mus. Hein., iii, 
1860, 64.—Prymnacantha popelairet Gould, Introd. Troch., oct. ed., 1861, 86; Salvin, 
Cat. Birds Brit. Mus., xvi, 1891, 428.— T[richolopha] popelairei Heine, Journ. fir Orn., 
1863, 209, in text.—Popelairia tricholopha Reichenbach, Aufz. der Colibr., 1854, 12; 
Troch. Enum., 1855, 9, pl. 815, figs. 4905-4907.— Popelaria tricholopha Ridgway, Proc. 
U.S. Nat. Mus., ili, Oct. 27, 1880, 315 (Colombia).—[Popelairea] popelairei Sharpe, 
Hand-list, ii, 1900, 144. 
b T[rochilus] conversii Bourcier and Mulsant, Ann. Sci. Phys. et Nat., etc., Lyon, ix, 
1846, 313 (Bogota, Colombia).—[Gouldia] conversi Bonaparte, Consp. Av., i, 1850, 86; 
Gould, Mon. Troch., iii, 1854, pl. 129; Introd. Troch., oct. ed., 1861, 86; Elliot, 
Classif. and Synop. Troch., 1879, 139, part.—P[rymnacantha] conversi Cabanis and 
Heine, Mus. Hein., iii, 1860, 65.—Prymnacantha conversi Salvin, Cat. Birds Brit. 
Mus., xvi, 1891, 430, part.— Mellisuga conversi Mulsant and Verreaux, Classif. Troch., 
1866, 79.—[Popelairea] conversi Simon, Cat. Troch., 1897, 41.—P[opelairea] conversi 
(typica) Hartert, Das Tierreich, Troch., 1900, 223. 
¢ Trochilus langsdorfi ‘‘ Vieill [ot]” Temminck, Nouv. Rec. Planches Coloriées, iv, 
livr. 11, June, 1821, pl. 66, fig. 1 (Brazil; coll. Langsdorff)—Ornismya langsdorffi 
Lesson, Hist. Nat. Ois.-Mouch., 1829, pp. xx, 102, pl. 26; Suppl. Ois.-Mouch., 1830-31, 
129, pl. 16; Les Troch., 1832, 101, pl. 35.—Orthorhynchus langsdorffi Lesson, Man. 
d’Orn., ii, 1828, 77.—[Gouldia] langsdorffi Bonaparte, Consp. Av., i, 1850, 86.—Gouldia 
jangsdorffi Gould, Mon. Troch., iii, 1854, pl. 128; Introd. Troch., oct. ed., 1861, 86; 
Elliot, Classif. and Synop. Troch., 1879, 138.—P[rymnacantha] langsdorfii Cabanis and 
Heine, Mus. Hein., iii, 1860, 65.—Prymnacantha langsdorfi Mulsant and Verreaux, 
