10 BULLETIN 86, TTNITED STATES NATIONAL MUSEUM. 



carolinensis, and ^^Antrostonms " vociferus, have been used, but sMns 

 of a considerable number of othier American and Old World species 

 have been examined. All comparisons with Caprimulgv^^ however, 

 are entirely with Caprmiulgua em-opaeua (see pi. 1, fig. 1), the type of 

 Gaprirrmlgus Linnaeus,^ for it is plain that the genus Capnrrmlgug, 

 even restricted to Old World species, is a very heterogeneous group, 

 and much in need of careful revision, for which the writer has at 

 present neither time nor adequate available material. 



In the first place, Antrostorrms carolinensis (see pi. 2, fig. 1), the 

 type by subsequent designation^ of the genus Antrostovrms Bona- 

 parte,^ and apparently the only member of this group as I now re- 

 strict it, differs greatly from Ca'prim/ulgus in both cranial and 

 external characters, and is really more closely related to Nyctidrom/us 

 than to either Oaprvmulgus or SetochoHcis.'^ Its diagnosis is as 

 follows : 



Genus ANTROSTOMUS Bonaparte. 



Similar to Oaprvm/ulgus linnseus, but interorbital region of 

 frontals narrower; palatines of very different shape, the distance 

 from their posterior border to the posterior ends of the foramina in 

 their middle portion much greater, nearly double, and these openings 

 much smaller; the infiated posterior parts of the palatines them- 

 selves produced on each side considerably farther back than at the 

 median line, thus more drawn to a point, and the postero-extemal 

 outline of palatines laterally much less convex, in fact almost straight; 

 vomer broader, and pointed, instead of bluntly rounded, at its anterior 

 end; maxillo-palatines longer and relatively narrower, more strap- 

 shaped, less shoe-shaped or hook-like; the palatal opening between 

 the halves of the premaxillary smaller and more regularly oval; 

 rictal bristles with long and conspicuous lateral filaments ; tail more 

 roimded ; and pterylosis different.^ 



All the other American goatsuckers commonly referred to the 

 genus Antrostomus, excluding those recently removed to other genera 

 by Mr. Kobert Ridgway,^ agree, so far as I have been able to exam- 

 ine them, very closely in external generic characters, but I have seen 

 the skull of only " Antrostonvus " vociferus, from which I have drawn 

 the cranial characters for this group. Since there are external 

 generic differences distinguishing all these species from both Gap- 

 rirrmlgus and Antrostorrms (ca/roUnensis) , and likewise so many and 

 such excellent cranial characters in ^^Antrostorrms " vociferus (see 



^OapHmulgus Llnnteus, Syst. Nat, ed. 10, vol. 1, 1758, p. 193 (type, by tautonymy, 

 CapHmulgus europaeus Linn^us). 

 " Gray, List Gen. Birds, 1840, p. 7. 



' Bonaparte, Geog. and Comp. List Birds Europe and North Amer., 1838 d 8 

 * See p. 11. 



« See Clark, Auk, vol. 18, 1901, pp. 168-169. 

 " Eldgway, Proc. BloL Soc. Wash., vol. 25, May 4, 1912, pp. 98-99. 



