BIEDS OF NORTH AND MIDDLE AMERICA. 58 Y 



del. Darker, the under parts more uniform in color, under tail-coverts more 

 heavily mottled, and spots on inner webs of primaries less distinct (some- 

 times obsolete). (Ecuador and Peru to southwestern Brazil; south- 

 eastern Brazil?; Paraguay?; Argentina?) 



Nyctibius griseus comutus? (extralimital).a 

 aa. A large area of white or buffy or conspicuous spots of the same on proximal middle 

 wing-coverts; under wing-coverts uniform sooty black or dark sooty brown. 

 h. Larger (wing 215-265, tail 137-187 mm.); general color deep brown or dusky, 

 c. Larger (wing 265, tail 185-187). (Central Colombia to northern Ecuador.) 



Nyctibius maculosus (extralimital).* 

 cc. Smaller (wing 215, tail 137). (Coast district of southern Brazil.) 



Nyctibius leucopterus (extralimital).c 



hh. Smaller (wing 160, tail 127); general color bright rufous. (Colombia to Guiana 



and Peru.) Nyctibius bracteatus (extralimital).** 



NYCTIBIUS GRANDIS (Gmelin). 



GRAND POTOO. 



Adults (sexes alike?). — Ground-color of whole plumage, except 

 lesser wing-coverts, remiges, and rectriees but including proxunal 

 secondaries, mixed white and buffy, in varying relative proportion, 

 sometimes more or less suffused, especially on scapulars, with 

 light rusty or cinnamon-rufous, everywhere irregularly baiTed and 

 marbled or coarsely vermiculated with dusky; pilemn and hind- 

 neck more regularly or uniformly barred, and with more or less dis- 



{?)Caprimulgus comutus Yieillot, Nouv. Diet. d'Hist. Nat., x, 1817, 245 (Paraguay; 

 based on Urutau Azara, Apunt. Parag., no. 308). — {'?)[Nyctibius] comutus Bonaparte, 

 Consp. Av., i, 1850, 58. — Nyctibius comutus Tschudi, Fauna Peruana, Aves, 1846, 

 123. — Nyctibius urutau Lafresnaye, L'Echo du Monde Sav., 3® an., no. 175, Oct. 22, 



1836, 188 (based on Urutau Azara, Apunt. Parag., no. 308); Mag. de Zool., ann. 7, 



1837, cl. ii, not. 83, pi. 82 (monogr.). — {!) Nyctibius pectoralis (not of Gould?) Sclater, 

 Proc. Zool. Soc. Lond., 1860, 79 (near Quito, Ecuador). — {?)Nyctibius griseus griseus 

 (not Caprimulgus griseus Gmelin) Ilartert and Venturi, Novit. Zool., xvi, 1909, 224 

 (Chaco, Argentina); Dabbene, Orn., Argent., 1910, 421 (Misiones and Santa Ana, 

 Argentina). 



1 have not seen specimens from southeastern Brazil, Paraguay, or Argentina, and 

 therefore do not know whether they are identical with those from other localities 

 mentioned or not. 



b Nyctibius maculosus Ridgway, Proc. Biol. Soc. Wash., xxv. May 4, 1912, 92 

 (Ambato, Ecuador; coll. Am. Mus. Nat. Hist.). 



c Caprimulgus leucopterus Maximilian, Reise Bi-as., ii, 1821, 227 (Caravellas, near 

 Bahia, Brazil; type now in coll. Am. Mus. N. H.); Beitr. Naturg. Bras., iii, pt. i, 

 1830, ^\l.— Nyctibius leucopterus Des Murs, Icon. Orn., livr. 9, May, 1847, pis. 49, 50; 

 Sclater, Proc. Zool. Soc. Lond., 1866, 130 (monogr.); Hartert, Cat. Birds Brit. Mus., 

 xvi, 1892, ^M.—lChordeiles] leucopterus Bonaparte, Consp. Av., i, 1850, 63. 



This species is autoptically unknown to me, and I am therefore unable to give the 

 color-characters wherein it differs from N. maculosus. 



d N'yctibius bracteatus Gould, Proc. Zool. Soc. Lond., xiv, 1846 (pub. May, 1846), 1 

 (Bogota, Colombia; coll. Mus. Roy. Inst. Liverpool); Sclater, Proc. Zool. Soc. Lond., 

 1866, 130 (monogr.), 585 (crit.); Hartert, Cat. Birds Brit. Mus., xvi, 1892, 623.— 

 Nyctibius rufus Cabanis, in Schomburgh's Reis. Brit. Guiana, iii, 1848, 711 (Cumaka, 

 Brit. Guiana); Sclater, Proc. Zool. Soc. Lond., 1866, 130 (monogr.), 585 (crit.). 



This species also I have not seen. 



