SYSTEMATICALLY ARRANGED BY DR, T. T. KAUP. 
half of the quills, which are longer than the tip. of the tail; 1-5 
quills emarginated. The Aquiline type. S. America. 
8. OC. macropterus, Vieill., Enc. p. 1215; C. albicolis, Vieill., 
Ene. 1214, young; F. palustris, Pr. Max.; Temm. pl. col. 22, ad.; 
C. superciliosus, Less. — The tarsus 78-115 ; mm. long, 
9. C. histrionicus, Kp.; F. histrionicus, Quoy. and Gaim., Voy. 
de la Uran. Ois. 15, 16; C. cinereus, Vieill., Azara 32.—The 
tarsus 62-69 mm. long; the tail with four bands. 
e. Subgenus Circus, Bonap.—The bill longer, larger, more hori- 
zontal, and the toes longer; 1-4 quills emarginated. The Buteo- 
nine type. ‘ 
10. C. spilonotus, Kp., Coll. of the Zool. Gard.—Head black; 
wings and tail without bars; beneath, ‘white, with black oblong 
spots on the crop: Asia. 
11. ©. ranivorus, Vieill.; F': ranivorus, Dand., Vaill. 23.—The 
wings and tail with bands. §S. Africa. 
12. C. eruginosus, G. Gray; F. eruginosus, Linn, ; pl. enl. 460, 
424; I’. rufus, Gmel. Naum, t. 37,1 3, 2 2; 38,1 $ young.—The 
wings and tail without bands. ‘Europe, Asia, Africa. 
13. C. assimilis, Jard. and Selby, Il. Orn,—The tarsus 94-100 ; 
middle toe, 39-44 mm. long. Australia. 
IV. Genus ELANUS, Say. 
The claws round; the tarsus with small scales. Cosmopolite. The 
Aquiline type. : 
a. Subgenus Gampsonyx, Vig.—The tip of the wings extends to 
the half of the tail; only the first quill emarginated. The Faleo- 
nine type. 9 
1. Elanus swainsonii, Kp.; Gampsonyx swainsonii, Vig.; Ei. 
torquatus, Cuv., Less. Hist. Nat. des Ois. vii. 207.—Size of a 
thrush; it has analogies with F. sparverius, §. America. 
6. Subgenus Elanus, Sav.— The wings longer than the short tail ; 
the first and second quill emarginated. The Milvine type. 
The subgenera c, d, e, are not discovered. 
2. E. melanopterus, Leach. ; E. ccesius, Say.; 7. melanopterus, 
Daud., Vaill. 36; F. vociferus et sonninensis, Lath.—The inner 
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