MONOGRAPH OF THE FALCONIDA, 
d. Subgenus Odontriorchis, Kp.— The large bill with a tooth. 
The Agquiline type. 
6. Pernis cayennensis, Kp.; F. cayennensis, Gmel.; pl. col. 204- 
270; Ast. cyanopus, Vieill. ; palliatus, Pr. Max. ; monachos 
Temm.; Sparv. monachus, Vieill.—Tail black, with three white a 
ash-gray bands. , 
e. Subgenus Pernis, Cuv.—Lorum and eye-region with scaly like 
feathers. The Buteonine type. : 
7. P. cristata, Cuv.; F. ptilorhynchus, Temm. pl. col. 44.—Hinl 
head with a crest. Asia. . 
8. P. apivorus, Ouy.; F. apivorus, Linn., Naum. 35-36.—Witl- 
out a crest. Europe, Africa. 
Ill. Genus POLYBORUS, Viet. (part) G. Gray. 
The nostrils are placed high on the cere, equally broad, oval, and 
on the under margin bending inwards in the middle; bored in the 
nasal-bones ; neck and feet very long. The Accipitrine type. 
1. P. brasiliensis, G. Gray; I’. brasiliensis, Gm.; Poly. vul- 
garis, Vieill. Gal. 7; Fo plancus, Mill. Cym.; plancus, t. 17; F. 
tharus, Gm. Chereway Jacq. The entire plumage numerous] 
banded. §. America. . 
IV. Genus ROSTRHAMUS, Less. 
The round nostrils placed in a soft membrane; the middle clav 
denticulated like the middle claw of Pelicanus or Ardea. The 
Aquiline, Pandion, or Pelicanoid type. 
1. R. sociabilis, D'Orb., Azara, N. 16; Herpetotheres sociabilis: 
Vieill.; Buteo hamatus, Vieill.; F. hamatus, Ill. ; pl. col. 61 ad. 
231, young; Oymindis leucopygos, Spix, t. ii.; R. niger, Less 
Lafresn. Mag. de Zool. 1834, pl. 20.— The old bird black, a fisher: 
S. America. 
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