Birds. 277 
secondary wing coverts blackish brown, with more or less of the 
inner vane of each feather white ; primary wing feathers white 
towards quills, blackish brown elsewhere; in the outermost 
ones the white occurs only upon the inner vanes, in the next to 
them it occupies both vanes, and in the still more internal, the 
white is crossed by black bands; outer vanes of secondaries 
an uniform dusky brown, inner ones brown and dusky or pure 
white inalternate transverse bands. Tail shghtly rounded, each 
feather marked with white; greyish white, or reddish white 
and black alternate bands; the number of the first description 
is usually three, besides some irregular ones or only spots to- 
wards quills; the bands seldom extend completely across, but 
have the extremities on each side commonly margined with the 
same black as the other bands, and between the last lght- 
coloured one, and the tip nearly two inches of uniform black ; 
bill and claws black ; cere and toes yellowish. Length from 
bill to base of tail nineteen inches ; length of latter nine inches. 
Young.—Plumage brown, feathers margined with rufous. 
Inhabits Africa. 
Faleo occipitalis, Daudin, Ois. ii. p. 40. Shaw, vil. p. 59. 
Nisser Tokoor, Bruce. Le Huppard, Le Vaill. Ois. Afr. pl. 2. 
Kuifkop Valk of the Colonists. 
Genus Potysororpes. Smith.* 
Bill. compressed particularly towards culmen, slightly arched 
from base, moderately hooked at the point ; nostrils longitudinal, 
linear ; cere smooth ; sides of head to some distance behind eyes 
bare. Tarsi long, slender, laterally compressed and reticulated ; 
toes long and slender, the middle one connected to the outer by a 
slight web at base; claws long, slender, and much curved. 
Wings nearly as long as tail; the fourth and fifth feathers the 
longest. 
Polyboroides typicus, Smith. Head, neck, and breast, dark 
blue-grey ; back scapulars and shoulders light grey, variegated 
with very fine undulating dull white lines; hinder portion of 
back, upper and under tail coverts, belly, thighs, and insides 
of shoulders, white, with fine transverse black lines ; intersca- 
pulars, each with a black blotch nearits point. Primary wing 
coverts dark grey tipt with white, and with a broad black band 
near the point. Primary wing feathers black, the outer vanes 
towards quills grey, the inner ones white, undulated with black, 
tips white. Tail dark green-black, crossed by a distinct broad 
white band, finely undulated with black near the extremity, and 
by some irregular ones toward the base; the tips of all the 
*South African Quarterly Journal, March 1830. 
[81] 
