136 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. XIII. 



Genus NYGTIPOLUS Ridgway. 



Nyctipolus Ridgway, Proc. Biol. Soc. Wash., XXV, 1912, p. 98 (Type Caprimul- 

 gus nigrescens Cabanis). 



*Nyctipolus nigrescens (Cabanis). DARK NIGHTHAWK. 



Caprimulgus nigrescens CABANIS in Schomb. Reis. Guiana, III, 1848, p. 710 (Brit- 

 ish Guiana) ; HARTERT, Cat. Bds. Brit. Mus., XVI, 1892, p. 572; CHUBB, Bds. 

 Brit. Guiana, 1, 1916, p. 369; GOELDI, Alb. de Aves Amazon, pt. 3, 1906, pi. 46. 



Range: Guiana, north Brazil, Peru, Ecuador and Colombia. 

 3: Colombia i; British Guiana 2. 



Nyctipolus whitelyi (Salvin). WHITELY'S NIGHTHAWK. 



Antrostomus whitelyi SALVIN, Ibis, 1885, p. 438 (Mt. Roraima, British Guiana). 

 Caprimulgus whitelyi HARTERT, Cat. Bds. Brit. Mus., XVI, 1892, p. 573, pi. XII; 

 CHUBB, Bds. Brit. Guiana, I, 1916, p. 368. 



' Range: British Guiana. 



Nyctipolus hirundinaceus hirundinaceus (Spix).* SPIX'S NIGHTHAWK. 



Caprimulgus hirundinaceus SPIX, Av. Bras., II, 1825, p. 2, pi. Ill, Fig. I (Upper 



Amazon? probably southern Brazil); HELLMAYR, Abh. K. Bayer Akad. Wiss., 



Munchen, XXII, 1906, p. 636. 

 Nyctipolus hirundinaceus OBERHOLSER, Bull. U. S. Nat. Mus., No. 86, 1914, 



p. 97, in text. 

 Nyctipolus hirundinaceus hirundinaceus CORY, Field Mus. Pub., No. 193, Zool. 



Ser., XII, 1917, p. 3. 



Range: Southern Brazil, Paraguay, N. Argentine. 



*Nyctipolus hirundinaceus crissalis (Cory). b BAHIA NIGHTHAWK. 

 Caprimulgus hirundinaceus crissalis CORY, Field Mus. Pub., No. 182, Orn. Ser., 

 I, No. 8, 1915, p. 301 (near Queimados, Rio de Peixe, Bahia, Brazil); Id., 

 No. 193, Zool. Ser., 1917, p. 4, in text. 



Range: Southeastern Brazil, Prov. of Bahia. 



3: Brazil (Queimados, Bahia), including the type. 



* Nyctipolus hirundinaceus hirundinaceus (Spix) : Outer webs of at least the two 

 outer primaries (sometimes three) without white mark. Somewhat resembles 

 Chordeiles acutipennis (Boon.), but aside from generic differences it may be dis- 

 tinguished at a glance by the much shorter wing (wing of C. acutipennis is more 

 than 150 mm.). Setopagis parvulus (GOULD) with which it has sometimes been 

 confounded, may be distinguished at a glance from any of the forms of N. hirundi- 

 naceus by its much darker plumage and the conspicuous black and white (sometimes 

 black and buff) scapulars (see Hellmayr, i.e., Tab. 2). The pattern of the white 

 markings on the primaries approaches nearest to that of N. h crissalis (CORY) but in 

 parvulus these areas are much larger and two specimens from Matto Grosso (cf and 9 ) 

 have two buff spots on the inner web of the outer primary instead of white ones. 

 In addition to other characters males of S. parvulus have a patch of white on the 

 ends of four outer tail feathers instead of on only the two outer feathers as in N. 

 hirundinaceus (see Hellmayr, I.e., p. 637, illustrations). 



b Nyctipolus hirundinaceus crissalis CORY. Differs from N. h. hirundinaceus 

 (Spix) in slightly different coloration and in having only the first outer primary 

 without white mark. Wing, 118; tail, 86 mm. 



