1847.] Proceedings of the Asiatic Society. 995 



7. B. malayanus, Raffles : B. bicolor, Eyton ; B. Ellioti, A. Hay, who 

 describes the young as that of the next species, Madr. Journ. XIII, 152 : 

 probably B. albirostris of Java, apud Horsfield :* females (?) described in 

 XII, 995. Common in the Malayan peninsula. Two females (?), from 

 Malacca ; presented by the Rev. F. J. Lindstedt : another, presented by J. 

 Middleton, Esq. 



In the following series of species, the casque is often wanting altogether, 

 or merely indicated ; and when present is generally very low, and slopes 

 forward with a gradual curve from the middle of the forehead, where its 

 hindmost portion is (more or less completely) concealed by the plumage. The 

 two next alone (of all the species before mej exhibit some tendency in the 

 casque to protrude a little backward, in old and fine specimens only ; but even 

 then the bulge is hidden by the feathers of the forehead. 



8. B. nigrirostris, nobis : adults described as those of the preceding 

 species by Lord Arthur Hay, Madr. Journ. XIII, 151. Plumage exactly as in 

 B. malayanus, except that the outer tail-feathers are not so deeply white-tipped 

 (viz. 2\ in., instead of 3| to 4 in.) ; and the size also is inferior, the wing barely 

 exceeding 11 in., instead of being from 12 to 13 in. : the young further differ 

 in having the white tips to the outer tail-feathers spotted over with black. 

 The bill and casque are black in adults, in the young white : and the form of 

 the casque refers this species to the present series of Hornbills ; it being low, 

 thinly compressed towards the front, and abruptly truncate anteriorly ; with a 

 longitudinal ridge on each side in old birds, occasioning a broad shallow 

 groove above and another below it. As the beak of Raines's malayanus, 

 when " surmounted hy& moderate-sized crest, which sloped gradually in front 

 to the curvature of the bill," is described as " yellowish-white," I conclude 

 that his specimen was a young male of the preceding species, rather than of 

 the present one, which I suspect would show much black on the bill when the 

 casque was so far developed. Both species inhabit the Malayan peninsula : 

 and at present we have only a specimen of the young of B. nigrirostris, 

 from Malacca j presented by R. W. G. Frith, Esq. 



9. B. birostris, Scopoli : B. ginginianus, Shaw : Putteal Dunnase, White,. 

 As. Res. IV, 121. Size small: colour grey, with a white abdomen and 

 ill-defined whitish supercilium ; the tail-feathers having a black subterminal 

 band, and white tips, the latter less developed on the middle pair ; great 

 alars also blackish, with white tips. Throat well clad with feathers. Casque 

 low and compressed, following the curve of the bill, with the extremity of 

 its ridge prolonged acutely forward in old birds. Inhabits India generally, 

 but I have never seen it from the countries eastward (not even from Assam). 

 In the Midnapore jungles, I observed it constantly in pairs ; instead of m 



* The name albiroslris, indeed, applies much better to this species. 



6 N 



