12 BULLETIN 86, UNITED STATES NATIONAL MUSEUM. 



Its geographical range is as follows: South America, Central 

 America, the West Indies, and North America excepting the northern 

 and central western portions. 



The species and subspecies at present referred to this genus, of 

 most of which the writer has examined skins, are as follows: 



Setochalcis sericocaudata (Cassin.)^ 

 Setochalcis rufa rufa (Boddaert). 

 Setochalcis rufa otiosa (Bangs). 

 Setochalcis saturata (Salvin). 

 Setochalcis hadia (Bangs and Peck).^ 

 Setochalcis salvini (Hartert).^ 

 Setochalcis cuhariensis (Lawrence). 

 Setochalcis vocifera vocifera (Wilson). 

 I Setochalcis vocifera arizonae (Brewster).* 

 Setochalcis vocifera macromystax (Wagler) .^ 

 Setochalcis vocifera oaxacae (Nelson).^ 

 Setochalcis vocifera chiapensis (Nelson). 

 Setochalcis ridgwayi ridgwayi (Nelson). 

 Setochalcis ridgwayi goldmani (Nelson).'' 



Phylogeny. — The genus Chordeiles, like the American branch of 

 the family Caprimulgidae, is of South American origin. This is evi- 

 dent from the facts that two of its three species, Ohordeiles acutipennis 

 and Chordeiles rupestris, are still permanently resident there; that 

 the forms of Chordeiles acutipennis which live in Central America 

 and Mexico are more or less migratory ; and, f uthermore, that Cho7'- 

 deiles virginianus, the remaining species, though at present entirely 

 West Indian and North American in its distribution during the 

 breeding season, returns entirely to South America to pass the winter. 



It seems probable that the present genus with its two nearest ge- 

 neric allies, Nannochordeiles and Nyctiprogne^ had a common im- 

 mediate ancestor; though, perhaps, Nannochordeiles, which is really 



^ 



1 This is the original spelling of the specific name. 



2 This is apparently the same as the subsequent Antrostomus nelsoni Rldgway (Proc. 

 Biol. Soc. Wash., vol. 25, May 4, 1912, p. 90). 



' This is the same as Antrostomus notaMlis Nelson, of later date. 



* This is a perfectly good race, differing from Setochalcis vocifera macromystax of the 

 eastern, central, and south central parts of Mexico, from southern Coahuila to Guerrero, 

 in lighter and more brownish coloration both above and below. It was originally de- 

 scribed by Mr. William Brewster as Antrostomus vociferus arizonae (Bull. Nuttall Orn. 

 Club, vol. 0, 1881, p. 69) from the Chiricahua Mountains In southern Arizona. It ranges 

 north to southern Arizona and central western Texas ; west to Arizona ; south to Jalisco, 

 Mexico ; east to Durango, Mexico, and central western Texas. 



8 This is Caprimulgus macromystax Wagler (Isis, 1831, col. 533), which has no more 

 specific locality than " Mexico." Since, in view of the several subspecific forms since 

 described, it is desirable to have a more definite type-locality, we designate as such 

 Mount Orizaba, Puebla, Mexico. 



• Still known from only the type specimen, a female, and if distinct from Setochalcis 

 vocifera macromystax Wagler, is certainly but a subspecies of Setochalcis vocifera. 



' Clearly not more than subspeciflcally different from Setochalcis ridgwayi. 



