BIRDS OF NORTH AND MIDDLE AMERICA. 305 
i. Under tail-coverts not all plume-like (all normal except in Gold- 
mania. 
j. Nasal operculum mostly exposed. 
k, Bill stouter, broader, abruptly widened at base; nasal oper- 
culum thicker, broader, more conspicuously exposed. 
1. Tarsus mostly naked; lateral rectrices broadly tipped with 
Wilts rc 5:2. 2, s'ecerarseseacorenseticie 2k Leucippus (extralimital).¢ 
il. Tarsus mostly naked; lateral rectrices without white. 
Amizilis (p. 405). 
ik. Bill more slender, narrower, not distinctly widened basally; 
nasal operculum thinner, narrower, with inner-posterior 
portion more extensively feathered. 
l. Under tail-coverts well developed, normal; outermost 
primary longer than next(?), never attenuated at tip. 
m. Under parts with at least lower abdomen white; tail 
olive-bronzy, usually darker subterminally. 
Agyrtria (p. 430). 
mm. Under parts without white, or else tail purplish black 
or purplish bronze; tail usually black or dark steel 
VLU Aa csagiel PRS sitsiotnermicsie.ciercions Saucerottia (p. 434). 
il. Under tail-coverts small and short, the three median 
ones stiff and plume-like; outermost primary not 
longer than ninth, in adult male shorter and with tip 
attenuated s.csecsseees oes s fecesiss Goldmania (p. 452). 
jj. Nasal operculum mostly concealed. 
k, Bill decidedly decurved; tarsi mostly naked. 
1. Frontal feathering not extending to anterior end of nasal 
operculum, the latter more exposed; rectrices and upper 
tail-coverts relatively narrower, the former more narrowly 
rounded at tip, the latter concolor with rump and back. 
Anthracothorax (p. 454). 
1. Frontal feathering extending to anterior end of nasal 
operculum, the latter more concealed; rectrices and 
upper tail-coverts relatively much broader, the former 
more broadly rounded or subtruncate at tip, the latter 
2 different in color from rump and back. 
m. Remiges not metallic-colored; tail slightly rounded; 
pileum, back, rump, and throat green, chest blue or 
violet, upper tail-coverts blue and green. 
Sericotes (p. 473). 
mm. Remiges brightly metallic green, like wing-coverts; 
tail emarginate; pileum, back, and rump velvety 
black, throat and chest reddish purple, upper tail- 
coverts bright metallic green....Eulampis (p. 477). 
a Leucippus Bonaparte, Consp. Av., i, 1850, 73. Type, as fixed by Gray, 1855, 
Trochilus fallax Bourcier.—Doleromyia Bonaparte, Rev. et Mag. de Zool., May, 
1854, 249; Ann. Sci. Nat. (Zool.), 4 sér., 1, 1854, 136. New name for Leucippus 
Bonaparte?—Dolerisca Cabanis and Heine, Mus. Hein., iii, Feb., 1860, 6. New 
name for ‘‘Doleromyia(!) Bp. 1854’’ and ‘‘Leucippus Gray, 1855 (nec Bp. 1849).” 
(Venezuela, including Margarita Island, and Colombia; monotypic?). 
I would exclude from this genus Trochilus chionogaster Tschudi, Leucippus pallidus 
Taczanowski, Thaumatias? chlorocercus Gould, and L. viridicauda Sclater and Salvin. 
The last two of these I have not seen, but they seem to be closely allied to the first 
and second, which differ in many structural details and also (conspicuously) in colora- 
tion from Leucippus fallax. The generic name which they should bear is probably 
Talaphorus Mulsant (Hist. Nat. Ois.-Mouch., i, 1874, 257), the type of which is 
Thaumatias? chlorocercus Gould. 
81255°—Bull. 50—11——20 
