osTiNOPS. 549 



its frontal shield at the base of: the forehead. The head is crested. 

 The wing is rounded, the second, third, and fourth primaries 

 longest and equal, the first is intermediate in length between 

 the fifth and sixth. The tail is rounded at the tip and graduated, 

 and about nine-tenths the length of the wing. The tarsus is 

 about two-thirds the length of the culmen, including the frontal 

 shield. Coloration : mule and female similar. 



Key to the Species. 



A. General colour of ])lumage black O. decumaiius, p. 549. 



B. General colour of plumage bronze-green O. vivid is, p. 552. 



697. Ostinops decumanus. 

 Great Crested Cacique. 



Xantliorrufs deci/mnniis Pallas, Spic. Zool. fasc. vi, p. 1,1769 (Surinam). 



Cassicus cristatus Cab. in Schomb. Reis. Guian. iii. p. 680, 1848. 



Ostinops decumumis Salvin, Ibis, 1SS5, p. 217 (Eartica Grove); Sclater, 

 Cat. B. Brit. Mus. xi. p. 315, 1886 (Bai-tica Grove) ; Quelch, 

 Timehri (2) iv. p. 102, 1890 (Great Falls), op. cit. v. p. 85, 1891 

 (Georgetown) ; Lloyd Price, toni. cit. p. 62 (nests and eggs) ; 

 C. A. Lloyd, op. cit. xi. p. 5, 1897 (nesting habits) ; Brabourne & 

 Chubb, B"^ S. Amer. i. p. 432, no. 4445, 1912. 



Ostinops deci/matnis deci/nu/niis Beebe, Tropical Wild Life in British 

 Guiana, p. 137, 1917 (Bartica). 



"Large Yellow-tailed Black Bunyas " {Quelch). 



Adult male. General colour both on the upper and under 

 surface glossy black, including the head, upper back, wings, and 

 middle tail-feathers, on the upper })arts, sides of face, throat, 

 breast, sides of bodv, abdomen, thighs, uiuler wing-coverts, and 

 quill-lining, on the under surface ; lower back, rump, upper and 

 under tail-coverts dark chestnut ; tail bright yellow. " Bill 

 white ; feet black" (Cat. B. Brit. Mus.). 



Total length 465 mm., culmen (including the frontal shield) 69, 

 wing 247, tail 200, tarsus 48. 



The specimen descriljed was collected on the Ituribisi River in 

 October r.lO.S. 



Adult J'^iiude. Similar to the adult nuile, and differs only in 

 having a shorter crest and snuiller nujasurtiuuMits. 



Total length ol5 mm., exposed culmen 55, wing 178, tail 149, 

 tarsus 45. 



The female of this species is not re{)resented in llic McConnell 



