ON THE CLASSIFICATION OP BIRDS. 
S9S 
Family BUCERID.®. Hornbills. 
The characters of this family are those of the only genus. 
Buceros, Linn. Bill enormous, generally furnished with 
protuberances of different shapes at the base of the 
upper mandible, beyond which the bill is much com- 
pressed, and both mandibles curved downwards ; the 
margins entire. Nostrils lateral, basal, very small, oval, 
or round, and almost naked. Wings short or moderate, 
rounded. Tail rather lengthened ; the feathers nar- 
row at their base, and obtuse at their tips. Feet 
short. Middle toe as long as the tarsus ; lateral toes 
unequal, the outer united to the middle as far as the 
first joint ; hinder toe shortest. Claws short, thick. 
The following species have been chiefly enumerated' 
M. Temminck : — 
B. rliinoceros. PI. Enl. 934. 
monoceros. lb. 873. 
luiiatu.-i. PI. Col. 546. 
cassidix. Ib. 210. 
Abyssinicus. PI.Enl.779. 
hydrocorax. Ib. 28,3. 
galeatus. Ib. 933. 
elatus. PI. Col. 521. f. 1. 
cylindricus. Ib. 521. f. 2. 
galeritus. Ib. 520. 
antraeicus. Ib. 529. 
corrugatus Ib. 5.31. 
comatus. Raff. PI. Col. 
Malayanus. Ib. 
cineraceus. Tem. Nepal, 
cavatus. Shaw. 
Malabaricus. Raff, 
galeatus. L. T. xiv. p. 578. 
pucoran. Raff, 
gracilis. PI. Col. 535. 
convexus. Ib. 530. 
exarhatus. Ib. 211. 
sulcatus. Ib. 69. 
buccinator. Ib. 284. 
Panayensis. PI. Enl. 780,781. 
nasutus. Ib. 890. 
erythrorhynchus. Ib. 260. 
Nepalensis. Hodgson. 
Tribe III. SCANSORES. 
Family RAMPIIASTIDiE. The Toucans. 
Bill enormous, vascular within ; the margins serrated. 
Wings short, rounded. Feet with two toes before, and 
two behind. 
Ramphastos, Linn. BiU smooth. Nostrils entirely 
concealed, and placed at the edge of the thickened 
frontlet of the bill. Wings short, rounded ; the four 
