98 Ridgway — Diagnoses of New Genera of American Birds. 



Antiurus gen. nov. 



Type, Stenopsis maculicaudus Lawrence. 



Nearest to Stenopsis, but with tenth (outermost) primary equal to or 

 longer than ninth; hill relatively much smaller and shorter; rectrices 

 relatively much broader, and much wider terminally than hasally (instead 

 of the reverse), and pattern of coloration peculiar. 



("ApTtos, different; ovpd, tail. ) 



Species: Antiurus maculicaudus (Lawrence). 



Setopagis gen. nov. 



Type, Caprimulgus parvulus Gould. 



Nearest Antrostomus, but differing in the relatively very small bill, and 

 in the adult male having a white patch on middle portion of primaries 

 (none of the numerous species of Antrostomus being thus marked). 



2??s, <tt)t6s, a moth; irayls, trap. ) 



Species: Setopagis parvulus (Gould). 



Nyctipolus gen. nov. 



Type, Caprimulgus nigrcscens Cahanis. 



Differing from Antrostomus Gould in having the whole tarsus (except 

 plantar surface i feathered: nostrils narrow, longitudinal, opening later- 

 ally beneath a tumid operculum; and primaries either uniform Mack or 

 with a white spot on inner web of seventh and eighth, or seventh, eighth, 

 and ninth. 



CSvktittoXos, roaming by night. ) 



Species: (1| Nyctipolus nigrescens (Cahanis); (2) Nyctipolus whitelyi 

 (Salvin). 



Ptilonycterus gen. nov. 



Type, Caprimulgus ocellatus Tschudi. 



Agreeing with Otophanes Brewster and Nyctagreus Nelson in possessing 

 a conspicuous erectile jugular lappet or Hap (the feathers of the chest 

 being abruptly much longer than those of breast and abdomen), but dif- 

 fering from both in having the feathers of the pileum broad and blended, 

 those of the supra-auricular region not noticeably elongated, feathering 

 of lores denser, longer, and more erect, and tarsus shorter than middle 

 toe without claw and feathered for upper half or more. 



( UriXov , a feather; wKrepis, a bat.) 



Species: Ptilonycterus ocellatus (Tschudi). 



This genus may possibly have already been named, the generic term 

 Nyctiphrynus Bonaparte having been used in connection with the type 

 species. The first publication of Nyctiphrynus dates LS54 (Conspectus 

 Systematis Ornithologise, p. 35), where it is a pure nomen nudum. Gray 

 adopts it in his " Hand List" (I, p. 59) as a subgenus of Caprimulgus, 

 and includes under it only C. ocellatus, and cites 1857, which probably 



