176 RIRDS OF THE 



the sexes in this species. As I have mentioned already, 

 one of my adult white billed males has the superciliary 

 stripe white, while in the other it is gray, and the same 

 is the case with the white-billed specimens of this species 

 in the Leyden Museum, while one of these latter has no 

 superciliary stripe at all. The black-billed specimens in the 

 Leyden Museum have, as a rule, the eyebrow gray, but 

 three specimens, one from the Continent, one from Banka 

 and one from Sumatra (the specimen described by Vorder- 

 man in his above quoted paper) have broad, pure white 

 eyebrows. For this reason I cannot consider the color of 

 the eyebrow a sexual character. Young birds are easily 

 recognized by having the white terminal part of the tail- 

 feathers spotted with black. 



Hab. South-eastern part of the Continent, Sumatra, 

 Banka and Borneo. 



59, Cranorrhinus corrugatus. 



Buceros corrugatus Temm. PL Col. II, pi. 531 [r/] (1832). 

 Buceros gracilis Temm. PI. Col. II, pi. 535 [v] (1832). 

 Cranorrhinus corrugatus Salvad. Ucc. Born. p. 86; Everett, L. B. 



Born. p. 163. 



An adult male from Poelau and an immature male from 

 the Upper Mahakkam. — Iris blood-red, bare skin round 

 the eye sea-green, bare chin and throat Naples-yellow, 

 bill orange-yellow, base of upper mandible and the entire 

 casque blood-red, feet dark grayish green, soles yellowish 

 gray. 



Hab. Malay Peninsula, Sumatra and Borneo. 



60. Buceros rhinoceros. 



Buceros rhinoceros Linn. Syst. Nat. I, p. 153 (1766); Everett, L. B. 



Born, p. 162; Sharpe, Ibis 1890, p. 14. 

 Buceros rhinoceroides Salvad. Ucc. Born. p. 87. 



Two specimens from Mount Kenepai, one from Mount 

 Liang Koeboeng and a young female from the Upper 

 Mahakiiara (November 1898). — Iris in the male red, in 

 the female white, base of bill and casque black, rest of 



Notes from tlie Leyden IMuseum, Vol. XXI. 



