BONTIAN HORNBILL. 31 



birds perching on the summits of the trees, and 

 often soaring with lofty and rapid flight, while the 

 young generally remain in the lower parts of the 

 trees, sitting motionless, with the head retracted 

 between the shoulders. I must not omit to observe 

 that, according to Mod sr. Levaillant, the red and 

 the black-billed Hornbills above described are in 

 reality totally distinct species, though generally 

 considered as the same. 



BONTIAN HORNBILL. 



Buceros Hydrocorax. B, fuscus, f route nigra ^ rostrofusco, galea 



plana mutka postice rotundata. 

 Brown Hornbill, with black front, brown bill, and flat obtusie 



casque rounded behind. 

 Buceros Hydrocorax. B» frnnte ossea plana antrorsum mutica, ah- 



dominefulvo. Lin. Si/st. Nat. 

 Bontius's Indian Raven. Will. orn. 

 Calao des Moluques. Buff. ois. PI. Enl. 283. 

 Indian Hornbill. Lath. syn. ' 



N. B. This, though usually described as a distinct species, is in 

 reality no other than the young of the Concave-Casqued 

 Hornbill. 



Somewhat larger than a Cock: length two feet 

 four inches: bill dusky; five inches and a half long, 

 and two and a half thick at the base, slightly bent, 

 and subserrated: on the top a kind of casque, of a 

 flattened form, widening towards the back part, 

 which is rounded, and projects over the back part 



