18. oETHOLOPntrs. 425 



Key to the Species. 



a. CheeliS and throat-featliers black ; greater wing- 



coverts and quills tipped with white alhocristatus, p. 4:25. 



b. Cheeks aud throat-feathers white with black 



shafts ; greater wiug-coverts and quills not 



tipped with white leucolophus, p. 426. 



1. Ortholophus albocristatus. 



Buceros albocristatus, Cassia, Juuni. Acad. Sci. Philad. i. p. 135, 



pi. XV. (1848); Schl. Mus. Pays-Bas, i. Buceros, p. 9 (1802); 



Beich. J. f. O. 1875, p. 12 ; id. J. f. O. 1877, p. 18 ; Sharpe >'• 



liouvier, Bull. Soc. Z. France, p. 310 (1876) ; Bocage, Orn, Amjula, 



p. 540 (1881). 

 Berenicornis albocristatus, Hartl. Orn. W.-Afr. pp. 163, 274 [part.] 



(1857); Cassin, P. Acad. Nat. Sci. Philad. 1859, p. 139 [part.]; 



SJimpe, Cat. Afr. B. p. 8 (1871) ; id. P. Z. S. 1871, p. 604, lig. 1 ; 



Bouvier, Cat. Ois. Marche, etc. p. 27 (1875) ; Shelley, Ibis, 1888, 



p. 69. 

 Anorrhinus albocristatus, Elliot, Mon. Bucerot. pi. 40 [text] (1877). 

 Buceros (Anorrhinus) albocristatus, Dubois, Bull. Mus. Belg. iii. 



p. 207 (1884). 

 Berenicornis macroiirus, Bonap. Consj). Gen. Av. i. p. 91 (1850) ; id, 



Consp. Vol. Anisod. p. 2 (1854). 



Adult. Top of the head and crest covered with long white 

 feathers, each with a black shaft-streak terminating in a bhxck spot 

 at the end of the feather ; remainder of plumage blade, glossed with 

 dark green on the upper parts aud breast ; a patch of white at the 

 base of the mandible and on the inner side and front of the shoulder ; 

 greater wing-coverts, quills, and tail-feathers tipped with white, 

 and a white spot on the outer web of the si,\ middle primaries ; tail 

 graduated, middle pair of feathers very long, twice and a half as 

 long as the fifth pair : naked skin round the eje blue, on the un- 

 feathered parts of the throat red ; legs and feet, bill and casque 

 black, a reddish-jellow mark extending forward from the nostril to 

 the cutting-edge of the upper mandible. Total length 31'5 inches, 

 wing 9-7, tail 1S"5, tarsus 1"5. 



Immature specimens resemble " the above, but the bill is uniform 

 black. 



Hah. \V. Africa to the north of the Congo. 



a. Imm. sk. North bank of Congo Eiver. Spencer Shield, Esq. 



6-f7. Ad. et innn. Caiuemons {Crossley). Shai-pe CoU. 

 sk. 



e. Ad. sk. Gaboon. H. T. Ansell, Esq. [P.]. 



f. Ad. sk. Gaboon {Ansell). Shelley Coll. 



