Casque large, high, much curved on top, horn-shaped ; large circular opening in front, 

 Hab. Abyssinia (Ruppell., Blanford) ; Zambesi region (Kirk ?) ; Natal (Ayres ?) . 



b. BUCORVUS GUINEENSIS. 



Bucorax abyssinicus, Hartl. Ornith. West-Afr. (1857) p. 165; Monteiro, Ibis (1862) p. 338. sp. 37; Gurney, Ibis 



(1861) p. 132 ? 

 Buceros carunculatus guineensis, Schleg. Mus. Pays-Bas (1862) p. 20. 



Bucorvus abyssinicus, Sharpe, Ibis (1869), p. 385 ; Reichenow, Journ. fur Ornith. (1875) pp. 12, 49? 

 Buceros abyssinicus, Gurney, Anderss. B. of Damara-Land (1872) p. 205. 

 Bucorax cafer, Bar. du Bocage, Proc. Zool. Soc. (1873) p. 698, figs. 2, 6 (adults), fig, 5 (juv.). 



JUV. 



Casque small, straight on top, tube-shaped ; small oblong opening in front. 

 Hab. Gold Coast (Schlegel) ; Sennaar (Baldamus?); Damara-Land (Anderss.?); Angola (Monteiro?). 



