SYSTEMATICALLY ARRANGED BY DR. T. T, KAUP. 
I. Genus ICTINIA, Vrieiur. 
The bill like Falco, with a tooth on the upper mandible, and a 
fine emargination-on the under mandible; the tail a little forked ; 
the secondaries a little shorter than the half of the wings; the first 
and second quill emarginated; hind toe with a broad sole. The 
Falconine type; America. 
1. Ictinia mississipiensis ; F. mississipiensis, Wils. iti. 25, 1; 
I. ophiophaga, Vieill., Gal. t. 1 f.; Milvus cenchris, Vieill.—The 
tail without bars. 
2. Ictinia plumbea, Vieill; F. plumbea, Gmel., Spix 86, adult, 
Temm. pl. col. 180, young. —The tail with white bars. 
II. Genus NAUCLERUS, Vice. 
The secondaries much shorter than the half of the wings; feet 
and toes very short; the tail much forked, and the first feather 
more than double the length of the middle feather. The swallow 
or true Milvine type. 
a. Subgenus Chelidopteryx, Kp. — A tooth on the upper man- 
dible and a fine emargination on the under mandible. The alco- 
nine type. 
1. WN. riocourii, Vig.; Hlanoides riocourii, Vieill., Gal. t. 17, 
Temm. pl. col, 85.—Light ash coloured. Senegal. 
d. Subgenus Nauclerus, Kp. — Without a tooth and an emargi- 
nation on the bill., The Agudline type. 
2. N. furcatus, Vig.; F. furcatus, Linn., Wils. 51, 2.—White, 
with black wings and tail. America. 
The Subgenera, b. ¢. e. are not discovered. 
‘se 
Il. Genus CIRCUS, Ayntiq. Laczr. 
The middle toe one half shorter than the tarsus; tarsus and toes 
with regular transverse scales. The Accipitrine or Grallatorial 
type. 
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