268 
ON THE CLASSIFICATION OP BIRDS. 
Cephalopterus, Geoffroy St. Hilaire, (^fig. 237. c) 
General structure of Comcina, but with an enlarged 
crest on the head, which advances in front, and over- 
shadows the bill. 
C. ornatus. PI. Col. 255. 
Gymnocephalus, GeofF. {fig. 237. d) Head and base 
of the bin entirely naked. 
G. calvus. Le Vaill. Ois. de I’Am. pi. 49. 
SuBFAM. FRIGILIN.®.* 
Bin rather lengthened, slender, tapering to a point, subfal- 
cate, andmoreor lessarched. 
Notch of the upper man- 
dible obsolete. Nostrils 
basal, lateral, oval, open, 
entirely concealed by hav- 
ing the frontal feathers 
directed forwards. Feet strong, robust. The length of 
the tarsus variable. Wings long, somewhat pointed ; 
but the three first quiUs graduated the fourth and 
fifth being longest. 
F. pyrrhocorax. PI. Enl. 531. erythropus. PI. Enl. 255. 
• This subfamily at present contains but two European birds, which 
almost appear to be types of as many genera: the above characters are 
more strictly applicable to the first. 
