498 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



for at least upper half (except behind) ; outer toe (without claw) not 

 reachmg quite to penultimate articulation of middle toe, as long as 

 or very slightly longer than inner toe ; hallux, with claw, shorter than 

 basal phalanx of middle toe. 



Plumage and coloration. — Feathers of pileum broad, blended (except 

 on middle of crown, where rather distinctly outlined) ; those on sides 

 of occiput not elongated; feathers of chest not unusually developed. 

 A white patch on middle of primaries (this buffy in females) ; rec- 

 trices (except two middle pairs) extensively white terminally, at least 

 the inner web, sometimes with inner web mostly white; thi-oat white, 

 or with a white band across lower portion. 



Range. — Costa Rica to Chile, Argentina, southeastern Brazil, and 

 Cayenne. (Monotypic ?.) 



KEY TO THE SUBSPECIES OF STENOPSIS CAYENNENSIS. 



a. Lateral rectrices mostly (sometimes wholly) white; primaries crossed by a median 

 oblique band of white. {Adult males.) 

 b. Coloration darker, the chest and breast much more heavily and extensively 

 barred. (Guianas; Tobago; Trinidad?) 



Stenopsis cayennensis cayennensis, adult male (extralimital).o 



bb. Coloration paler, the chest and breast inuch less heavily and extensively barred. 



c. Under parts mostly white, often pure white, the under tail-coverts usually 



more or less buffy; only the chest barred with dusky and strongly suffused 



with buff; general tone of coloration of iipper parts Hghter and grayer. 



(Islands of Curasao and Margarita; coast of Venezuela?) 



Stenopsis cayennensis insularis, adult male (p. 499). 

 cc. Under parts distinctly biiff. approaching white only on parts of throat; chest 

 and breast barred with dusky and suffused with Hght buffy brown or cin- 

 namon; general tone of coloration of upper parts darker and browner. (Pan- 

 ama to Costa Rica). .Stenopsis cayennensis albicauda, adult male (p. 502). 



[Caprimulgus] cayennensis GmeUn, Syst. Nat., i, pt. ii, 1789, 1031 (based on 

 Engoulevent de Cayenne Buffon, Ois., vi, 545; Crapaud-volant de Cayenne Buffon, 

 PI. Enl., pi. 760; White-necked Goatsucker Latham, Sjoiopsis, ii, pt. 2, 599). — 

 Stenopsis cayennensis Cassin, Proc. Ac. Nat. Sci. Phila., v, 1851, 179; Hartert, Cat. 

 Birds Brit. Mus., xvi, 1892, 583, part. — [Caprimulgxis'] cayanus Latham, Index Orn., 

 ii, 1790, 587 (=C, cayennensis Gmelin). — Caprimulgus cayanensis Temminck, Cat. 

 Syst., 1807, 137. — [Antrostomus cayanensis Bonaparte, Consp. Av., i, 1850, 61. — 

 Stenopsis cayanensis Sclater, Proc. Zool. Soc. Lond., 1866, 140 (monogr.). — (?)Capri- 

 mulgus leopetes Jardine and Selby, Ulustr. Orn., ser. 1, vol. ii, pt. 6, Aug., 1830, pi. 

 87 [p. 75] (Tobago; coll. Sir W. Jardine). — (?) Caprimulgus odonpteron Lesson, Rev. 

 Zool., ii, April, 1839, 105 ("insulae Antillarum " ) . — {l){Antrostomvs'] odonpteron Bona- 

 parte, Consp. Av., i, 1850, 61. — {?)Stenopsis tobagensis Ridgway, Proc. Biol. Soc. 

 Wash., xxi, Oct. 20, 1908, 195 (Tobago; coll. U. S. Nat. Mus.). 



1 am now doubtful whether the Tobago bird can be separated from that of the 

 Guianas, a larger series of specimens being required to settle the question; and I have 

 not seen an example from Trinidad. An adult male from Roraima, British Guiana, 

 is so much darker than other specimens from the Guianas and has so much more 

 black on outer rectrices, besides being larger, that it is possible it may represent a 

 different subspecies. 



