MONOGRAPH OF THE FALCONIDA. 
sphenurus, Vieill. Gal. 15.— Tail longer than the body. Aus- 
tralia. 
¢. Subgenus Heteroaétus, Kp.— Tarsus high; toes very short; 
wings shorter than the tail; the sole of the toes with obtuse warts; 
the plumage banded. The Aceépitrine type. 
5. H. aguia, Kp.; F. aguia, Temm. pl. col? 302; Spiz. melano- 
leucus, Vieill.; Azara, N. 8; Spiz. fuscescens, Vieill.; Azara, N. 9, 
young.— Above and the crop dark gray; wings and beneath with a 
great number blackish gray bands. This species has a great many 
analogies with Buteo erythronotus, which represents in its genus 
and subgenus the same type. S. America. 
d. Subgenus Pontoaétus, Kp., G. Gray. — Tarsus high, with the 
third part feathered, and long middle toe; 1-5 quill with a slender 
emargination. The Aguiline or Pandion type. 
6. H. leucogaster, F'. leucogaster, Gmel.; pl. col. 49; Blagre, 
Vaill. 5; H. spenurus, Gould, Birds of Austr. ii. 1.— The middle 
feathers of the tail considerably longer than the first. Africa, Asia, 
Australia. 
7. H. macei, Cuv.; pl. col. 8, 223; Ag. leucorypha, Pall.; H. 
fulviventer, Vieill.; H. (eucuma) albipes, Hodgs. — The occiput 
with long, small, and pointed feathers; the adult bird with white 
tail, having broad black terminal band. Asia. 
8. H. vocifer, Cuy., Vaill. 4; F. vocifer, Daud., Lath. — White, 
with rufous belly, tibial feathers, inferior tail-covers and inferior 
wing-covers. Africa. 
e. Subgenus Thalassaétus, Kp. — With a very high bill, short 
wings and remarkably long tail; tarsus half feathered. The Buteo- 
nine or true Vulturine type. 
9. H. pelagicus, Temm. et Schleg. Fauna Jap., young, Kittliz, 
Icones ad.; F. leucopterus, Temm. pl. col. 489.— Front, superigr 
part of the wings, beneath and tail, white, ad.; the tarsus covered 
with small scales. Asia. 
Y. And last Subfamily, Burzonina. 
In this last subfamily, [bicter is the typical genus, which with the 
se subfamily, represents the Gallinaceous or Vultwrine type, on 
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