BIRDS OF NORTH AND MIDDLE AMERICA. 305 



a. 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. 



I. Tarsus mostly naked; lateral rectrices broadly tipped with 



white Leucippus (extralimital).a 



II. Tarsus mostly naked; lateral rectrices without white. 



Amizilis (p. 405). 

 kk. Bill more slender, narrower, not distinctly widened basally; 

 nasal operculum thinner, narrower, with inner-posterior 

 portion more extensively feathered. 



I. 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). 



7nvi. Under parts without white, or else tail purplish black 



or purplish bronze; tail usually black or dark steel 



blue Saucerottia (p. 434). 



II. 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 Goldmania (p. 452). 



jj. Nasal operculum mostly concealed. 



k. Bill decidedly decurved; tarsi mostly naked. 



I. 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). 



II. 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 



different in color from rump and back. 



VI. Remiges not metallic-colored; tail slightly rounded; 



pileum, back, rump, and throat green, chest blue or 



Adolet, 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). 



" Leucippus Bonaparte, Consp. Av., i, 1850, 73. Type, as fixed by Gray, 1855, 

 TrocMlus fallax Bourcier. — Doleromyia Bonaparte, Rev. et Mag. de Zool., ^lay, 

 1854, 249; Ann. Sci. Nat. (Zool.), 4 ser., 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 (nee Bp. 1849)." 

 (Venezuela, including Margarita Island, and Colombia; monotypic?). 



I would exclude from this genus Trochilus chionogaster Tschudi, Leucippus palUdus 

 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 



