220 
AVES. 
Genus 8. — C E R T HIA.— Linnaeus. 
Generic Character .—Bill long, or of medium length in some 
species; slender, curved, triangular, and compressed; nostrils 
basal, horizontal, and half closed by a membrane ; three toes 
before and one behind, the exterior adhering at its base to the 
middle one; claws much hooked, that on the hallux longest; 
tail graduated; shafts stiff and pointed ; fourth quill longest. 
Certhia familiaris .— The Common Cheeper. 
Plate XLIX. fig. 12. 
Yellowish-brown above, throat, breast, and belly white, the 
crissum ochre-yellow; upper mandible dusky, lower one white; 
tail grayish; legs and toes yellowish-brown. Five inches and 
a half long. Inhabits Europe. 
Genus 9.—C CERE BA— Brisson. 
Generic Character .—Bill slightly arched, thick at the base, 
and sharp-pointed; edges of the mandibles inflected; tongue 
long, but not extensible; bifid and filamentous; tarsus longer 
than the middle toe; lateral toes equal; tail of medium size. 
Coereba cyanea .— The Cyanean Ccereba. 
Plate XLI. fig. 9. 
Throat, neck, breast, abdomen, and crissum, rich cobalt blue; 
wings golden-yellow; back, wings, and tail, black, with an 
oblique blue band ; inside of the front, and crown of the head, 
bright green ; ophthalmic region deep black; irides brown ; bill 
black; feet flesh-colour; claws black. Five inches long. In¬ 
habits Cayenne. 
Genus 10. — TROCHILUS.— Linnaeus. 
Generic Character —Bill long, straight, arcuated in some 
species, tubular, very slender, with the base depressed and acu¬ 
minated ; upper mandible nearly enveloping the under one; 
tongue long, extensible, bifid, and tubular; nostrils open before, 
and covered by a membrane; legs very short; tarsus shorter 
than the middle toe ; the three anterior toes almost divided ; 
wings long, graduated ; the first quill longest. 
