284 African Zoology. 
bluish grey ; interscapulars, back, rump, and scapulars, bluish 
grey ; shoulders jet black; chin, throat, breast, belly, vent, 
and inside of wings, pure white. Primary and secondary wing 
coverts bluish grey, with the edges of inner vanes white, and 
some of the feathers distinctly tipt with that colour; primary 
quill feathers hoary grey, shaded towards tips with reddish 
brown ; secondaries bluish grey. Tail slightly forked, pale 
bluish white ; shafts dark reddish brown; legs and toes yellow; 
claws black. Length eleven inches. 
Young.—Bill black; base of under mandible, and the part 
of the upper one adjoining it, yellowish ; front reddish white ; 
crown and back of neck dusky, slightly variegated with very 
fine reddish tawny streaks ; interscapulars dirty blackish blue, 
with fine reddish white tips ; back uniform dusky blue ; scapu- 
lars dirty blackish blue, with a tinge of brown, and all broadly 
tipt with dull white; shoulders black, many of the feathers 
faintly tipt with white. Primary and secondary wing coverts 
bluish grey, many of them with white tips; primary wing 
feathers blackish blue with white tips; secondaries with reddish 
white tips. Chin and throat white; breast and belly pale 
tawny or dull reddish white; thighs white. Tail a pale dusky 
blue with shades of brown; part of edges of inner vanes white; 
ae of feathers white or tawny; legs and toes yellow; claws 
black. 
Inhabits South Africa. 
Elanus Melanopterus, Leach. Falco melanopterus, Daud. 
Orn. Le Blac, Le Vaill. Ois. d’ Afrig. &c. 36 & 87. 
Genus Navciervs. Vigors. 
Bill weak, compressed ; nostrils sub-oval, oblique ; wings 
long, second and third quills longest ; tail long and deeply 
forked; tarsi short, weak, and reticulated ; feathered below the 
knees. 
Nauclerus Riocourii, Vigors. Body above ashy grey; be- 
low pure white; a white stripe on the forehead; a line before 
and behind the eye black. Tail grey; bill black; cere and 
tarsiyellow; second quill feather the longest. Length fourteen 
inches and a half. 
Inhabits Senegal. 
Elanoides Riocurii, Vieill. 
Sus-Fam. BUTEONINA. 
Bill curved from the base, the edges entire; tarsi naked or 
covered with feathers ; wings almost as long as the tail ; figure 
rather robust. 
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