344 . ON THE CLASSIFICATION OF BIRDS. 
Centrocircus, Sw. Tail feathers lanceolate, ending in 
naked points. — 
C. urophasianus. N. Z. ii. pl. 58. phasianellus. Edw.117. 
Prerpix, Briss. Nostrils and tarsi naked. Bill with 
the general structure of Tetrao; short, strong, and 
very convex ; the tip broad. Wings generally round- 
ed. Tail very short. 
Perdix. Partridge. Frontal feathers advancing in front 
between the nostrils. Tarsus smooth ; posterior tarsal 
scales large, transverse, strong, in two rows, and nearly 
equal to the anterior scales. Inner toe much shorter 
than the outer ; hinder toe. very small. Claws very 
broad, and nearly straight. Tail even, or very slightly 
rounded. Universal. 
_ P. cinerea. Selby, pl. 61. 
Chetopus, Sw. Francolin. Frontal feathers divided 
in front by the base of the bill. Tarsus generally 
armed with spurs in the male: _posterior tarsal 
scales, small, hexagonal, much smaller than those 
- In front. Inner toe equal, or nearly so, to the outer. 
Claws compressed. Tail very short, often nearly hidden 
by the covers. Chiefly Tropical Asia and Africa. 
C. Adansonii. West. Af. 11. Yaillantii. Pl. Col. 477. 
Pondicerianus. P].C.213. 
Coturnix, Briss. Quails. Stature small. Wings with 
the first quill as long as the others. Tail very short, 
fasciculated, concealed by the covers. Universal. 
- C. Europeus. Selby, pl. 62. : 
Ptilopachus, Sw. Bill small, slender. Nostrils naked, 
very large, occupying one half the length of the 
bill. Wings rounded. Tail broad, rounded, larger 
and longer than in Perdix ; the feathers very soft. 
Feathers of the back and rump with the shafts 
thickened, and apparently spinous, as in Ceblepyris. 
Tarsus shorter than the middle toe. Lateral toes' 
nearly equal. Africa and India. 
P. erythrorynchus. West. Af. ii. 
