312 
ON THE CLASSIFICATION OP BIRDS. 
Feet as in Bucco. Tail moderate, broad, even. The 
Old World.* 
Y. torquilla. Selby, pi. 38. f. 4. 
OxYBYNCHus, Tem. Bill as in Yunx ; but the culmen 
more, and the gonys less, curved. Wings lengthened, 
pointed ; the first quill nearly as long as the second, 
with the outer web crenated. Feet short, insessorial. 
Lateral toes equal. Tail moderate, even. South 
America. 
O. cristatus. Zool. 111. i. pi. 49. 
Family CERTHIADjE. Creepers. 
Bill much compressed, entire. Feet insessorial. Toes 
greatly developed, and generally united at their base ; 
the hinder always lengthened. Tail cuneated, rigid. 
SiiBPAM. CE RH III an,®. 'Yt'us Creepers, 
Bill generally curved, and greatly compressed. The an- 
terior toes more or less united. Tail rigid, with the 
shaft projecting beyond the webs. The typical division. 
Certhia, Linmeus. {fig. 280. a, b) Bill lengthened. 
slender ; both mandibles curved, entire. Wings rather 
lengthened ; the three first quills graduated ; the two 
next equal and longest. Tail lengthened, graduated, 
and divaricated ; the feathers only slightly rigid, 
lanceolate, and acutely pointed; the tips not very stiff. 
Legs short, slender. The middle toe longest ; the 
inner much shorter than the outer; hinder toe longer 
than the tarsus, the claw very long, and but slightly 
curved. All the claws very slender. The fissirostral 
type. Europe, America. 
C. familiaris. Selby, pi. 39. f. 2. 
* This and the next genus appear representatives of two subfamilies. 
