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Wiegm. Arch. p. 345 (1847) (type: B. abyssimicus); Bucorax, Sundevall, Oetv. Vet.-Akad. Férh. 
Vol. 6, p. 161 (1849) (type : B. abyssznicus). 
Characters. Bill long, compressed, slightly curved, terminating in a sharp point; 
casque large, extending from base of culmen for about one-third its length, and open or closed 
anteriorly. Throat naked. Wings ample, reaching to one-third the length of the tail. Tail long, 
ample, rounded. Tarsus very long, covered with scales; toes rather short; claws short, strong. 
Plumage black, except the primaries, which are white. 
Geographical Distribution. Africa. Only two species and one variety are known. 
KEY TO THE SPECIES 
A. Casque open anteriorly ; base of the upper mandible with a veddish plate. 
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2. Casque slightly open in front; sise much smaller, . . . Ee Bi GUINEENSIC: 
B. Casque closed ov scarcely open anteriorly; size large. 
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1. Bucorvus abyssinicus (Boddaert) (Plate 1, Figs. 1, la.) North-eastern Africa : 
Abyssinia, Sennaar, 
Kordofan, Somali, 
Zanguebar N. 
Buceros abyssinicus Boddaert, Tabl. Pl. Enl. p. 48 (1783). 
Buceryos byac Dumont, Dict. Sc. Nat. Vol. 6, p. 201 (1817). 
Buceros carunculatus WWagler, Syst. Avium, Buceros, no. 6 (1827). 
Bucorvus abyssinicus Lesson, Traité d’Ornith. p. 256 (1831); Elliot, Monogr. Bucerot. 
pl. 1 (1882); Dubois, Bull. Mus. Hist. Nat. Belg. p. 221 (1884). 
Tragopan abyssinicus Gray, List Gen. of Birds, p. 65 (1841). 
Bucorax abyssinicus Sundevall, Oefv. Vet.-Akad. Férh. Vol. 6, p. 161 (1849). 
Tmetoceros abyssinicus Cabanis & Heine, Mus. Heinean. Vol. 2, p. 175 (1860). 
Buceros carunculatus abyssinicus Schlegel, Mus. Pays-Bas (Buceros), p. 19 (1862). 
2. Bucorvus abyssinicus var. guineensis (Schlegel). West Africa, from the 
1201. N. andthe Gold 
coast to the Congo 
and North Angola. 
Buceros abyssinicus (part.) auct. plur. (nec Bodd.). 
Buceros abyssinicus guineensis Schlegel, Mus. Pays-Bas (Buceros), p. 20 (1862). 
Bucorvus pyrrhops Elliot, Ann. Mae. Nat. Hist. Vol. 20, p. 171 (1877); Monogr. Buce- 
rot. pl. 2 (1882). 
Bucorax guineensis Barboza du Bocage, Proc. Zool. Soc. Lond. p. 698 (1873); Bull. Soc. 
Zool. Fr. p. 375 (1877). 
Bucorvus abyssinicus var. guineensis, Dubois, Bull. Mus. Hist. Nat. Belg. Vol. 3, p. 221 
(1884). 
Bucorax abyssinicus (part.) Ogilvie-Grant, Cat. Birds Brit. Mus. Vol. 17, p. 350 (1892). 
3. Bucorvus caffer (Verreaux). South Africa, from the 
Cap to the Zambezia 
Buceros leadbeateri (2?) Vigors et B. cuffer Verreaux,. in Hartlaub, Ornith. West-Afr. p. 166 and Benguela. 
(1857). 
Buceros abyssinicus (part.), auct. plur. (nec Bodd.). 
Buceros carunculatus cafer Schlegel, Mus. Pays-Bas (Buceros), p. 20 (1862). 
Bucorwus abyssinicus Layard, Birds S, Afr. p. 228 (1867). 
Tmetoceros abysstnicus (part.) Finsch & Hartlaub, Vog. Ost-Afr. p. 480(1870); Heuglin, 
Ornith. N.-O -Afr. Vol. 1, p. 731 (1871). 
Bucoywus leadbeater’ Gray, Hand-list of Birds, Vol. 2, p. 131 (1870). 
Bucorax caffer Barboza du Bocage, Proc. Zool. Soc. Lond. p. 698 (1873). 
Bucorvus caer iMiot, Monogr. Bucerot. pl. 3 (1882). 
Bucorvus abyssinicus var. cafer Dubois, Bull. Mus. Hist. Nat. Belg. Vol. 3, p. 222 (1884). 
