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.)^ 



SetochcHcis rufa rufa (Boddaert). 



Setochdkis rufa otiosa (Bangs) . 



Setochdicis satwrata (Salvin). 



SetochaZcis hadia (Bangs and Peck).^ 



Setochcdcis scUvmi (Hartert).* 



Sefochalcis cubcmensis (Lawrence). 



Setochdds vocifera vocifera (Wilson). 



Setochalcis vocifera arisonae (Brewster).* 



Setochalois vocifera macromystax (Wagler) .^ 



Setochalcis vocifera oaxacae (Nelson) .^ 



Setochalcis vocifera chiapensis (Nelson). 



SetochdlGis 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, Chordeiles acutipenms 

 and Chordeiles rupestris, are still permanently resident there; that 

 the forms of Chordeiles acutipermis which live in Central America 

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

 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, NannochordeUes and Nyctiprogne, had a common im- 

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



1 This Is the original spelling of the specific name. 



' This Is apparently the same as the subsequent Antroatomus neUoni Ridgwa; (Proc 

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



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



'This is a perfectly good race, differing from SetocJialcia vocifera macromystax of the 

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

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

 scribed by Mr. William Brewster as Antrostomus vocijerus arisonae (Bull. Nuttall Orn. 

 Club, vol. 6, 1881, p. 69) from the Chlrieahua 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. 



°Thls is Oaprimulgtia macromystax Wagler (Isis, 1831, col. 533), which has no more 

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

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

 Mount Orizaba, Fuebla, Mexico. 



" Still known from only the type specimen, a female, and if distinct from Betochalois 

 vocifera maoromystaic Wagler, is certainly but a subspecies of Betochalcis vocifera, 



' Clearly not more than subspeclfically difCerent from Setoohalois ridgwayi. 



