MONOGRAPH OF THE FALCONIDA:, 
tooth; 1-5 quill distinctly emarginated; the nostrils covered with 
bristle-feathers ; the interior web of the quill banded, and the tail 
with 4-6 bars; chin and under tail-covers white; the middle toe 
very long. ‘The Aguiline type. This subgenus shows more than 
five species, because some species are subspecies, climatic varieties, 
or races of another species. 2 
6. Nisus exilis; F. exilis, Temm. pl. col. 496; N. perspi- 
cillaris, Riipp. neue Wirbelth, 18, 1, 2; Acc. rufivenitris, A. 
Smith, Ill. S. Af.—Beneath and under wing-covers rufous. Africa. 
6, Nisus fringillarius ; N. communis, Cuy.; PF. nisus, Linn., 
Naum. t. 19, 20; Acc. fringillarius, Briss. — Beneath rufous 
or blackish banded; the adult female beneath with blackish bars; 
the male with a tail slightly forked. Europe, N. Africa. 
6, Nisus madagascariensis, Verreanx, Quart. Journ. 8. Aft. 
Inst., p. 80.—Tail with five, and on the external feathers with 
seven or eight black bars. 
6, Nisus fuscus; F. fuscus, Gmel.; F. velox et pennsylva- 
nicus, Wils. xlvi. 1, pl. col. 67, young.—The male very like frin- 
gillarius, tail slightly forked; the larger female with oblong spots 
on the lower parts, like a young Astur palumbarius. North 
America. i 
6°, Nisus vel. Ace. erythronemius, G. Gray.— Large like frin- 
gillarius, with rufous tibial feathers ; beneath, white ; every feather 
with 3-5 bars, and blackish shafts. Bolivia, British Museum. 
7. Nésus tachiro, Cuy., Vaill. +. 24, young; Ace. polyzonus, A. 
Smith, Ill. S. Africa 2; Astur unduliventer, Riipp., neue Wirbelth, 
t. xvii, 1, 2, col. 377, young. — Beneath with a great number of 
bars; tarsus 60-63 mm. long. Africa. 
8. Nisus pileatus, Cuv.; F.pileaius, Pr. Max.; Temm. pl. col. 205, 
$ ad. F. beskii, Licht. ? young; F. cooperi, Bonap. Am. Orn., pl. 
x. 1, 2 young.—Tarsus 58-67; middle toe 36-45 mm. long; the* 
adult bird beneath clear ash coloured, S. America, very rare in 
N. America. 
e. Subgenus Urospizia, Kp.— The secondaries cover more than 
3 of the quills; 1-5 quill emarginated; the tail as long as the 
body, and with 14-19 small bars; the middle toe shorter than the 
scaled part of the targus. Australia. 
9. Nisus torquatus, Cuy. xliii. 93.— Size of N. fringillarius, 
tail small, forked, with fourteen or fifteen bars. 
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