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

 Genus NYCTIDROMUS Gould. 



Nyctidromus GOULD, Icones Avium, II, 1838, pi. 2 (Type Nyctidromus derbianus 

 Gould). 



*Nyctidromus albicollis albicollis (GmeL). CUIEJO OR PARAUQUE. 



Caprimulgus albicollis GMELIN, Syst. Nat., I, pt. II, 1789, p. 1030 (Cay- 

 enne). 



Nyctidromus albicollis HARTERT, Cat. Bds. Brit. Mus., XVI, 1892, p. 587; 

 GOELDI, Alb. de Aves Amazon, pt. 3, 1906, pi. 46; STONE, Proc. Acad. N. S. 

 Phila., 1879, p. 305 (Honda). 



Nyctidromus albicollis albicollis RIDGWAY, Bull. U. S. Nat. Mus., No. 50, VI, 

 1914, p. 537; CHAPMAN, Bull. Am. Mus. N. H., XXXVI, 1917, p. 274 (many 

 localities in Colombia). 



Range: From southern Mexico (Chiapas) and British Honduras to 

 Panama and in South America to the Guianas and Amazon Valley, north 

 Brazil, Trinidad, Ecuador and Colombia. 



t4i: Mexico (Colima 4, Yucatan i); Guatemala 9; Costa Rica 3; 

 Nicaragua 7; Panama i; Colombia i; Venezuela (Orope, Encontrados, 

 Caracas, etc.) n; Surinam i; and Brazil (Rio Branco, Itacoara, Ama- 

 zonas) 3. 



*Nyctidromus albicollis obscurus* Cory. PERUVIAN PARAUQUE. 



Nyctidromus albicollis obscurus CORY, Field Mus. Pub., No. 182, Orn. Ser., I, 

 No. 8, 1915, p. 301 (Yurimaguas, Peru). 



Range: Peru. 



9: Peru (Yurimaguas, Moyobamba, Rioja, etc.), including the type 

 specimen. 



*Nyctidromus albicollis derbyanus b (Gould). EARL OF DERBY'S 

 PARAQUE. 



Nyctidromus derbyanus GOULD, Icones Avium, II, 1838, p. 12 (South America = 

 southern Brazil); ALLEN, Bull. Am. Mus. N. H., V, 1893, p. 124; CHUBB, 

 Ibis, 1910, p. 267 (Paraguay); GRANT, Ibis, 1911, p. 319. 



Range: Central and southern Brazil, eastern Bolivia and Para- 

 guay, N. E. Argentine. 



3: Brazil (Rio Preto and Andarahy, Bahia). 



Nyctidromus albicollis obscurus CORY: Differs from both N. a. albicollis (GMEL.) 

 and N. a. derbyanus (GOULD) in having the general coloration decidedly darker and 

 more mixed with blackish; the under wing coverts much more extensively black and 

 less marked with brown. The black on wings and tail is deeper black (not brownish 

 black as in the other races.) Wing, 153 mm. 



b Nyctidromus albicollis derbyanus GOULD: Coloration variable, but readily dis- 

 tinguished from N. a. albicollis by its larger size. Male, wing, 165 to 180 mm. 



