OYANOCORAS. 



587 



two-thirds that of the second. The tail is rounded at the tip and 

 nearly equal in length to the wing. The tarsus exceeds the 

 length of the middle toe and claw by about one-third. Coloration : 

 male and female similar. 



715. Oyanocorax cayanus. 



Oorvus cayanus Linn. Syst. Nat. i. p. 175, 1766 (Cayenne). 



Oyanocorax cayanus Cab. in Schomb. Eeis. Guian. p. 683, 1848 ; Sharpe, 

 Cat. B. Brit. Mus. iii. p. 122, 1877 (British Guiana); Salvin, Ibis, 

 1885, p. 219 (Bartica Grove, Camacusa) ; Beebe, Qur Search for a 

 Wilderness, pp. 172, 345, 1910 ; Brabourne & Chubb, B. S. Amer. i. 

 p. 441, no. 4540, 1912 ; Beebe, Tropical Wild Life in British Guiana, 

 p. 137, 1917 (Bartica). 



Adult male. Fore part of head and sides of face black ; throat, 

 fore-neck, and sides of neck soot-black ; a small bine spot above 

 and below the eye j hinder crown, hind-neck, and a blotch on the 

 fore part of the cheeks white ; entire back and scapulars smoke- 

 brown, more or less tinged with purple ; outer aspect of wings, 

 upper tail-coverts, and greater portion of the tail purple ; inner 

 webs of flight-quills blackish ; apical portion of tail white ; breast, 

 abdomen, sides of body, thighs, under tail-coverts, axillaries, and 

 under wing-coverts cream-white ; the feathers that separate the 

 fore-neck and breast are fringed with white ; under surface of 

 flight-quills dark brown, inclining to greyish brown towards the 

 base ; lower aspect of tail blackish at the base with obsolete cross- 

 bars' and broadly tipped with white. 



Total length 350 mm., exposed culmen 20, wing 165, tail 161, 

 tarsus 48. 



The specimen described was collected on the Mazarnni River 

 in 1905. 



Adult female. Similar to the adult male but rather smaller. 

 Wing 160 mm., tail 151. 



Immature. Similar to the adult birds, but the feathers on the 

 throat not so dark and more downy in texture on the entire under 

 surface. 



The young bird mentioned above was collected on the Supenaain 

 River. 



Breeding-season. Unknown in British Guiana. 



Nest, Unrecorded in British Gruiana. 



Eggs. Undescribed from British Guiana. 



