19, NTCTIBITJS. 627 



and bars of blackish ; top of the head somewhat blackish ; upper 

 tail-coverts with broad bars ; bend of wing and smaller upper wing- 

 coverts almost blackish, the latter crossed by a broad rufous-buff 

 stripe; larger wing-coverts with longitudinal rufous-buff marks; 

 wing and tail-feathers dark rufous, with broad deep brown bars ; 

 under wing-coverts deep brown, with pale rufous bars ; lower surface 

 a little lighter than the upper parts, more or less uniform towards 

 the lower abdomen and lower tail-coverts ; lower breast with some 

 blackish terminal spots, forming a kind of irregular broken band. 

 Total length about 18 inches, wing 12, tail 10*8. 



A female from Guiana is much smaller and measures only about 

 16 inches in length, wing 11, tail 9-5. Erom the small material 

 before me I am unable to say whether this is a sexual difference or 

 whether the specimens from Guiana form a smaller race. There is 

 no difference in colour. 



Hub. Upper Amazons, Ecuador, Peru, and Guiana. 



n. Ad. sk. Saiayacu, Ecuador {Buckley). Sclater Coll. 



I), c. Ad. sk. Sarayacu, Ecuador (Buckley). Salvin-Godman Coll. 



d. 2 ad. sk. Bartica Grove, Brit. Guiana, Salviu-Godman Coll. 

 Dec. 7 {H. Whitely). 



5. Nyctibius aethereus. 



Caprimulgus aethereus, Wied, Beitr. iii. p. 303 (1830); Thienem. 



Fortpfl. yes. Voq. pi. xUi. fig. 20 (I8o4j ; Koeniy-Warth. J. f: O. 



1868, p. 371 (uidific). 

 Nyctibius fethereus, Bp. Consp. i. p. 58 (18o0); Cass. Fr. Ac. Phil. 



V. p. 181 (1851) ; id. Cat. Caprim. Mus. Phil. ( 18ol) ; id. U. S. Expl. 



Evj). p. 190, Oni. Atl. pi. xiv. (1858) ; Bunn. Syst. Ueb. Th. Bras. 



ii. p. 375 (1856) ; Cab. Sr Heine, Mus. Hein. iii. p. 94 (1860) ; Scl. 



P. Z. S. 1866, p. 128; Pelz. Orn. Bras. p. 10 (1867); Gray, 



Hand-l. i. p. 55 (1869) ; Scl. Sf Salv. Nomencl. Av. Neotr. p. 95 



(1873) ; Cab. J.f. 0. 1871, p. 226 (Rio) ; SalviTi, Cat. Strickl. Coll. 



p. 374 (1882). 



Adult. Upper surface rufous-brown, with narrow deep brown 

 longitudinal shaft-stripes and vermiculations ; top of the head deep 

 brown, with pale almost whitish markings ; upper tail-coverts and 

 tail with broad bars ; quills dark brown with irregular paler bars ; 

 wing-coverts spotted with white ; lower surface dark greyish brown 

 with deep brown shaft-lines, blackish terminal and very pale sub- 

 terminal spots on the breast, rufous on the flanks, paler, and almost 

 whitish towards the lower abdomen and lower tail-coverts ; under 

 wing-coverts blackish, with whitish bars. Total length about 20 

 inches, wing 12'.5 to 13'3, tail 12. 



This species is distinguished from N. lonr/icaudatus by the less 

 rufous colour, especially on the under surface ; the blackish spots 

 on the breast are more numerous ; the top of the head, which is 

 deep brown and rufous in W. Jonjicaudatus, is blackish with very 

 pale buff bar-like spots. The size a little larger. 



Hub. Brazil. 



