SCANSOBES. PRIMARY DIVISIONS. 129 
men, we believe, is in Euiope, appears to be rather 
larger than a thrush; some of the touraccos, forming 
the genus Corythaix, are not larger than a magpie, and 
are fully equal to some of the small hornbills ; while 
C. glgantea, the last of the group, is not inferior to 
the middle-sized Buccridm. The Buceros galeatus, al- 
ready mentioned, is probably a distinct type in its own 
family; and seems to he that which, both in form and 
habits, — for it is described as entirely frugivorous, 
— completes the union of the two families. 
CHAP. IX. 
ON THE TRIBE OF SCANSORES, OR CLIMBING BIRDS. 
(143.) We now enter upon the Scansoriai. Or- 
der, comprising all those families whose feet are 
more particularly organised for climbing trees ; and 
whose different modifications of structure have been 
already so fully explained. * These members, — ex- 
cepting in the genus which unites the Scansores with 
the Rasores, — are particularly short, for they are 
never used to walk upon the ground. With the excep- 
tion of one family, the whole have the toes placed in 
pairs, — that is, there are two before and two behind, 
— a peculiarity which renders them of easy determin- 
ation, notwithstanding the many and striking variations 
in the form of the bill and wings. The whole of these 
birds are naturally arranged in the following primary 
divisions or subfamilies: — 1. The Certiiiad^, or 
creepers ; — 2. The Picidjb, or woodpeckers ; — 3. The 
PsixTAciDiB, or parrots ; — 4. The Ramphastid.®, or 
toucans; — and, lastly, the Cuculidaj, or cuckows. 
These families, collectively, form a complete circle ; the 
• VoL I. p. 133. 
K 
VOL. II. 
