1. BUCOEAX. 349 



cSJ^Chin and throat uaked. (Plu- [p. 390. 



mage blackish brown.) 12. Anobrhinus, 



d*. Chin and middle of throat 



feathered. (Plumage of under- [p. 302. 



parts brick colour.) 13. Ptilol^^imus, 



e'". Casque small but well-developed 

 or absent; crest very slight. 



(Plumage grey.) 14. Ocyceeos, p. 394. 



f". Casque rudimentary ; base of the 

 upper mandible transversely 

 gi-uoved; chin and throat naked ; 

 crest moderate. [Size very 



large.] 9. AcEEOS, p. 380. 



i". A naked wattle at the base of the [p. 388. 



throat ; casque large and swollen . 11. Ceeatogymna, 

 d'. Feathers on the lores very long, 

 directed upwards and forwards ; tail 

 long or very long. 

 k". Crest cooiposed of hairy feathers ; 



middle pair of tail-feathers not [p. 423. 



much longer than the following . . 17. Beeenicoenis, 

 I". Crest composed of soft feathers; 



middle pair of tail-feathers much [p. 424. 



longer than the next pair 18. Oetholophus, 



II. Anterior part of casque solid ; neck and 

 throat and a line down the centre of the 

 back uaked ; tail wedge-shaped ; centre 



pair of tail-feathers very long, more than [p. 426. 



twice as long as the second pair 19. PiHINoplax, 



1. BUCOEAX. „ 



Type. 



Bucorvus, Less. Traite Orn, p. 259 (1831) B. abyssinicus. 



Tragopan, Grai/, List Gen, B. p. 65 (1841) B. abyssinicus. 



Tuietoceros, Cab. Wiegm. Arch. p. 345 (1847) B. abj'ssinicus. 



Bucorax, Sundev. CEfv. Konyl. Vetens. Ak. Fork. vi. 

 p. 161 (1849) B. abyssinicus. 



Bill long, pointed, compressed and slightly curved. Casque 

 covers the basal third or more of the culmen, aud is either elevated, 

 subcyliudrical and open in front, or keel-shaped and compressed. 

 Throat naked. Tail rather short, subequal. Tarsus very long, 

 about twice as long as the middle toe and claw. 



Range. Africa. 



Key to the Sjyecies. 



I. Casque wide open in fi'ont abi/ssinicus, p. 349. 



II. Casque closed or slightly open in front caff'er, p. 351. 



I. Bucorax abyssinicus. 



Le Grand Calao d'Abyssinie, Daube.nt. Fl. Enl. no. 779. 



Le Calao d'Abyssinie, Buff. Hist, Nat. Ois. vii. p. 155 (1780). 



Abyssinian Hornbill, Lath. Gen. Syn, i. p. 347 (1781). 



