52 



Capt. G. E. Shelley on the 



a^. With no white ou the quills. White of ab- 

 domen not extending ou to the chest 5. B. cristatus. 



i'. With portion of the secondaries white. Chest 

 and abdomen white. 

 li'. With no white on the greater wing-coverts. 

 h^. Casque large. With more than half of 



all the secondaries and tail-feathers black 6. B. buccinator, 

 c^. Casque obsolete or rudimentary ; bill 

 strongly corrugated. 

 c*. White of secondaries not extending over 

 more than the end-half of the feathers. 

 Basal half of all the tail-feathers black 7. B.Jistulator. 

 dK White of secondaries extending to their 

 bases. White of tail variable, accord- 

 ing to age, always covering more than 

 the end-half of all but the centime fea- 

 thers, and in fully adults reaching to 

 the base, or nearly so, of these feathers 8. B. sharpii. 

 c^. With broad white ends to the greater coverts ; 

 casque strongly dcAeloped. 

 cP. Outer primaries entirely blaclc. With a [cus. 



broad black subbasal baud on the tail . . 9. 5. snbcyUndri- 

 e'. The greater part of the outer and the ends 

 of all the primaries white. Tail, with 

 the exception of the two centre feathers, 



entirely white 10. B. leucopygius. 



h. Entire tail, including the two centre feathers, 

 white, with a broad black central band. 

 /'. '\\'ith broad white ends to the greater wing- 

 coverts. Black of the chest extending down 



the front of the thighs ] 1. B. ci/lindricus. 



g^. With no white ends to the greater wing- 

 coverts. Entire thighs white 12. B. albotibiulis. 



5. BUCEROS CRISTATUS. U' ^ ' ^ ■" 



Buceros cristatus, Riipp. N. W. 1835, p. 3, pi. 1 '; id. Syst. 

 Uebers. p. 79; Cass. Pr. Ac. Philad. 1859, p. 139'; Kirk, 

 Ibis, 1864, p. 326^ Sclat. P. Z. S. 1864, p. 111^; F. & H. 

 Vog. Ostafr. p. 482'; Heugl. N.O.-Afr. pp. 730, clvi; 

 Fiscli. & Reichen. J. f. O. 1880, p. 141°; Dubois, Bull. Miis. 

 Belg. iii. 1884, p. 200; Fiseh. Zcitsclir. ges. Oni. 1884, 

 p. 36r; id. J. f. O. 1885, p. 126"; Shelley, P. Z. S. 1885, 

 p. 224^ Reichen. J. f. O. 1887, p. 60 ^ 



