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



Chordeiles rupestris zaleucus 3 Oberholser. OBERHOLSER'S NIGHT- 

 HAWK. 



Chordeiles rupestris zaleucus OBERHOLSER, Bull. U. S. Nat. Mus., No. 86, 1914, 

 p. 118 (Pabas, Peru). 



Range: Resident in eastern and central Peru. 



Genus NANNOCHORDEILES Hartert. 



Nannochordeiles HARTERT, Ibis, 1896, p. 374 (Type Chordeiles pusillus Gould). 



Nannochordeiles pusillus pusillus (Gould). LEAST NIGHTHAWK. 



Chordeiles pusillus GOULD, Proc. Zool. Soc. Lond., 1861, p. 182 (Bahia, Brazil); 

 HARTERT, Cat. Bds. Brit. Mus., XVI, 1892, p. 618; HELLMAYR, Nov. Zool. 

 XV, 1908, p. 78 (Rio Thesouras). 



Range: Central and eastern Brazil. (Piauhy, Matto Grosso, etc., 

 to northern S. Paulo). 



*Nannochordeiles pusillus septentrionalis b Hellmayr. VENEZUELAN 

 LEAST NIGHTHAWK. 



N[annochordeiles] pusillus septentrionalis HELLMAYR, Nov. Zool., XV, 1908, p. 78 



(Maipures, Orionoco, Venezuela). 

 Nannochordeiles septentrionalis CHUBB, Bds. Brit. Guiana, I, 1916, p. 359. 



Range: Venezuela, northern Brazil and Guiana. 

 4: Brazil (Boa Vista, Rio Branco). 



Genus NYCTIPROGNE Bonaparte. 



Nyctiprogne Bonaparte, Consp. Syst. Orn., 1854, p. 35 (Type Caprimulgus 

 leucopygus Spix). 



Nyctiprogne leucopygia (Spix). WHITE-RUMPED NIGHTHAWK. 



Caprimulgus leucopygus SPIX, Av. Bras., II, 1823, p. 3, pi. Ill (Amazon River 



region, Brazil). 

 Nyctiprogne leucopygia HARTERT, Cat. Bds. Brit. Mus., XVI, 1892, p. 619; 



CHUBB, Bds. Brit. Guiana, I, 1916, p. 360; STONE, Proc. Acad. Nat. Sci. 



Phila., 1913, p. 198 (Cano Corosal, Venezuela). 



Range: Brazil, Guiana and Venezuela. 



Chordeiles rupestris zaleucus OBERHOLSER: "Resembling C. r. rupestris SPIX, but 

 female more grayish above, particularly on wing coverts with a large white patch, 

 47 mm. long on middle portion of inner, web of fourth (outer) primary, which extends 

 to and includes the shaft at this point; inner web of outer rectrix with two broad 

 dark brown bands (instead of spots); spots on breast larger and more numerous." 

 (Detailed description is given by Oberholser, I.e.). 



b Nannochordeiles p. septentrionalis HELLMAYR: Similar to N. p. pusillus 

 (GOULD), but decidedly smaller; wing, 127, tail, 69 mm. 



