232 
ON THE CEASSIPICATION OP BIRDS. 
with the cuhnen gradually curved to the tip^ which 
is bent, but not hooked, over the lower mandible. 
Feet formed both for perching and walking. 
Petrooincla, Vigors. Rock Thrushes. Bill thrush- 
like : the tip of the upper mandible abruptly bent 
down, and nearly entire. Wings moderate; the 
first quill spurious ; the second shorter than the 
three next, which are equal, and the longest. Tail 
oven. Anterior scales divided. Lateral toes equal. 
Claws small, but slightly curved. 
P. montana. Ois. d’Af. pi. 101. 
Tetrophila, Sw. Bill thrush-like : the culmen and tip 
of the upper mandible gradually bent, and entire. 
^Vings and tail as in the last. Legs pale ; the anterior 
scales entire. Lateral toes unequal ; the inner shortest. 
Claws moderate, and fully curved. 
P. cyanocepliala. Gould’s Century, pi. 19. 
Merula, Willughby. Bill moderate, straight; the 
culmen slightly curved ; the tip distinctly notched : 
the gape slightly bristled. Wings lengthened, pointed; 
the first quill spurious ; the second a little longer 
than the third, which is longest. Tail moderate, 
nearly even. Feet moderately long. Lateral toes 
almost equal, but the inner rather the shortest. Tarsal 
scales entire, smooth. 
M. nigra. Selby, pi. 4.5, f. 4, torquata. Selby, pi. 44. f. 2. 
Iliaca. lb. pi 45 . f. 3 . cyanotis. III. Orn. pi. 46. 
Orpheus, Sw. General structure of Merula. Bill more 
curved in the cuhnen ; the notch small, or nearly 
obsolete, llictal bristles rather strong. Wings 
rounded; the three first quills graduated. Tail 
lengthened, graduated, or rounded. Inner toe mani- 
festly shorter than the outer. 
O. polyglottus. Wilson pi. IQ. f. J. rufus. Wils. 14. f. 1 
ciirvirosiris, PI. Col. 44], 
Cossypha, Vigors. General structure of Orpheus, but 
the wings more rounded ; and the tail less so. The 
rictus smooth. Africa only. 
