CYAXOCORAX. 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 o£ the middle toe and claw by about one-third. Coloration : 

 male and female similar. 



715. Cyanocorax cay anus. 



Corvus eayamis Linn. Syst. Nat. i, p. 175, 1766 (Cayenne). 



Cyanocorax cayanus Cab. in Schomb. Reis. Guian. p. 688, 1848 ; Sharpe, 

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

 1SS5, p. 219 (Bartica Grove, Camacusa) ; Beebe, Our Search for a 

 Wilderness, pp. 172, 315, 1910 ; Brabourne & Chubb, B. S. Amer. i. 

 p. 411, no. 4510, 1912 ; Beebe, Tropical Wild Life in British Guiana, 

 p. 137, 1917 (Bartica). 



t 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 ; 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 p.ortion of the tail purple ; inner 

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

 abdomen, sides of body, thighs, under tail-cuverts, 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. 



Tot;d length 350 mm., exposed culmen 20, wing 165, tail 161, 

 tarsus 48. 



The specimen described was collected on the Mazaruni 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 tho 

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

 surface. 



The young bird mentioned aljove was collected on the Su}K'nnjini 

 River. 



Breedinr/season. Unknown in British Guiana. 



Nest. Unrecorded in l^ritish Guianii. 



Eggs. Undescribed from Britisb (jiuiana. 



