n6 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. XIII. 



Nyctibius aethereus HARTERT, Cat. Bds. Brit. Mus., XVI, 1892, p. 627; RIDGWAY, 

 Bull. U. S. Nat. Mus., No. 50, VI, 1914, p. 586, in key. 



Range: Southeastern Brazil. 



Nyctibius longicaudatus (Spix). LONG-TAILED POTOO. 



Caprimulgus longicaudus SPIX, Av. Bras., II, 1825, p. i, pi. i (Rio Japura, 

 Brazil). 



Nyctibius longicaudus HARTERT, Cat. Bds. Brit. Mus., XVI, 1892, p. 626; RIDG- 

 WAY, Bull. U. S. Nat. Mus., No. 50, VI, 1914, p. 586, in key; CHAPMAN, Bull. 

 Am. Mus. N. H., XXXVI, 1917, p. 272 (Novita, Colombia). 



Range: Guianas to eastern Ecuador, Peru and Colombia." 



*Nyctibius griseus griseus (Gmel.). GIANT POTOO. 



[Caprimulgus] griseus GMELIN, Syst. Nat., I, 1789, p. 1029 (Cayenne). 

 Nyctibius jamaicensis (not Caprimulgus jamaicensis Gmel.) b. smaller form; 



HARTERT, Cat. Bds. Brit. Mus., XVI, 1892, p. 626. 

 Nyctibius griseus griseus HELLMAYR, Nov. Zool., XIII, 1906, p. 37; RIDGWAY, 



Bull. U. S. Nat. Mus., No. 50, VI, 1914, p. 586, in key. 



Range : Trinidad to the Guianas and Lower Amazon Valley, Brazil, 

 i: British Guiana. 



Nyctibius griseus cornutus b ( Vieillot). PARAGUAYAN POTOO. 



Caprimulgus cornutus VIEILLOT, Nouv. Diet. d'Hist. Nat., X, 1817, p. 254 



(Paraguay). 



Nyctibius cornutus TSCHUI, Fauna Peruana Aves, 1846, p. 123. 

 Nyctibius griseus cornutus RIDGWAY, Bull. U. S. Nat. Mus., No. 50, VI, 1914, 



p. 587 (in key and footnote). 

 Nyctibius jamaicensis (not Caprimulgus jamaicensis Gmel.) GRANT, Ibis, 1911, 



p. 320 (Paraguay). 



Range: Ecuador, Peru, Paraguay, southern Brazil, N. Argentine. 



*Nyctibius griseus jamaicensis (GmeL). JAMAICAN POTOO. 



Caprimulgus jamaicensis GMELIN, Syst. Nat., I, 1789, p. 1029 (Jamaica). 



Nyctibius jamaicensis GOSSE, Bds. Jamaica, 1847, p. 41; Id., Illustr. Bds. Ja- 

 maica, 1849, pi. 6; CORY, Auk, 1886, p. 338; Id., Bds. West Indies, 1889, 

 p. 133; HARTERT, Cat. Bds. Brit. Mus., XVI, 1892, p. 625, part. 



INyctibius pallidus GOSSE, Bds. Jamaica, 1847, p. 49 (probably albinistic speci- 

 men); Id., Illustr. Bds. Jamaica, 1849, pi. 7; CORY, Auk, 1886, p. 339; SCOTT, 

 1892, p. 276. 



Range: Island of Jamaica, Greater Antilles. 

 3 : Jamaica. 



Cf. Chapman, (I.e.). 



b Nyctibius griseus cornutus (VIEILLOT) : Differs from N. g. griseus (GMEL.) in 

 being "darker; the under parts more uniform in color; under tail coverts more 

 heavily mottled and spots on inner webs of primaries less distinct (sometimes 

 obsolete) " Ridgway, I.e. 



