1G0 
AVES. 
Gypcetus barbatus. — The Bearded Vulture. 
Plate XXXVII. fig. 8. 
Blackish on the back, with a white line down the middle of 
each feather; neck and upper part of the body bright yellow; 
head surrounded by a black fillet. Expanse of wings about 
eight feet. Inhabits Egypt, Abyssinia, and the German and 
Swiss Alps. 
Genus 4. — GYPOGERANUS. — Illiger. 
Generic Character. — Beak shorter than the head, thick, 
strong, hooked, and bent from its base, somewhat arched and 
compressed at the point; with a cere at its origin ; nostrils with¬ 
in the cere, lateral, a little separated at the base, oblong, open, 
and placed diagonally, legs very long and slender; tibia fea¬ 
thered, tarsus very long, tapering downwards ; toes short, ro¬ 
bust, and warty below, the anterior one united at the base ; the 
hallux articulated on the tarsus; wings long, the first five quills 
longest, and nearly equal; carpus of the wings armed with a 
blunt spur. 
Gypogeranus serpentarius. — The Secretary, or Serpent 
Eater. 
Plate XXXVII. fig. 9- 
Ash-coloured, breast with longitudinal black streaks; tail 
wedge-shaped, middle tail feathers longer than the others ; head 
with a pendant crest; eyes surrounded by a bare orange-coloured 
skin. Size of a stork. Inhabits the Cape of Good Plope. 
Genus 5. —POLYBORUS.— Vieillot. 
Generic Character. —Beak somewhat elongated, deep, com¬ 
pressed laterally, and strongly hooked at the tip of the upper 
mandible; cere hispid, continued over the cheeks and around 
the eyes; nostrils narrow, elliptical, oblique, and placed near the 
upper edge of the beak; wings somewhat rounded, nearly as 
long as the tail; third and fourth quills longest; legs long, 
naked, and reticulated; claws of moderate length and curvature. 
