( 52 ) 
Scansorea. 
2, Picus, Lin. Wood- 
peckers. 
Beak long, straight. Tongue protractile, Tail with 10 pen- 
angular, compressed in slim, armed with spines feathers, the stems stiif 
a wedge at the extre- towards the end,which and elastic, supporting 
mity, for clearing the curve backwards. (1) them as a l>uttress in 
barks of trees. climbing. Fig. 125. 
a. P. Proper. 
Fig. 125. 
b. PicoiDES, Lacep. Tri- 
DACTYL.E. 
Only 2 toes before and 
\ behind. Fig. 127. 
c. 
Beak slightly arched, 
approaching that of the 
Cuckows. Fig. 129. 
3. YUNX, Lin. TORCOLS. 
Wry-necks. 
Beak straight, point- Tongue protractile, Tail with pen-fea- 
ed, almost round and but without spines. thers of the ordinary 
withoutangles.Fig.l 66. form. 
4. CucULUs , Lin. 
Cuckows. 
Beak moderate, some- 
what cleft, compressed, 
slightly arched. 
a. C. Proper. 
Beak of moderate Tarsi short. Fig. 132. Tail with 10 pen-fea- 
length. Fig. 130. (2) ' thers. 
b. CouAS. VailL. 
Tarsi long. Fig. 134. 
(1) The tongue, pushed out by the elastic cartilaginous prolongations of the os 
hyoidis (Fig. 428, c), elongates considerably beyond the beak (Fig. 125) and is 
imbued with a viscous juice, furnished by large salivary glands : it is drawn in by 
two muscles, rolled like ribbands around the trachea, the cornea of the os hyoidis 
reascending under the skin and upon the head as far as the superior base of the 
beak (Fig. 128.), and the sheath of the tongue folding on itself at the bottom of 
the gullet. 
(2) There are African species with the beak more depressed (Fig. 13j. C. au- 
ratiis) and others with the beak deeper vertically. (Fi^, J 32. C. Tachiroit.) 
Tail rather long. Birds of passage. In- 
sectivorous. 
