Order I. ACCIPITRES. 
The second Family, 
FALCONIDiE, or Falcons, 
have the Bill partly covered at the base by a cere, compressed on the sides, and the culmen curved 
from the cere to the tip, which is hooked and acute ; the lateral margins cither toothed or festooned ; 
the Wings long and pointed; the Tail moderate and broad ; the Tarsi and loes of various lengths and 
strong ; and the Claws long, curved, and acute, especially those of the inner and hind toes. The head 
and neck are covered with feathers, and the eyes placed laterally, deeply sunk, and protected by a bony 
brow. 
The first Subfamily, 
POLYBORINA:, or Caracaras, 
have the Bill compressed on the sides, slightly hooked at the tip, and the lateral margins slightly fes- 
tooned; the Wings long, with the third to the fifth quills the longest ; the larsi long, slender, and 
covered with irregular scales ; the Toes moderate and strongly scaled above, and all armed with strong 
acute claws. 
Ibycter Vieill.* 
Bill moderate, slender, with the culmen gradually curved to the tip, Avhich is slightly hooked, the 
sides much compressed, the lateral margins slightly sinuated; the nostrils lateral, placed in the fore 
part of the cere, large, and more or less rounded. Wings long, pointed, with the fourth quill the 
longest.. Tail lengthened, broad, and rounded at the end. Tarsi about the length of the middle toe, 
feathered below the knee, covered with large irregular scales in front, and with small ones behind and 
on the sides. Toes lengthened, strongly scaled above, the inner stronger and shorter than the outei, 
and all armed with long curved claws. The lores, sides of the head, and throat, denuded of feathers. 
The species are peculiar to the warmer parts of South America. Scarcely any thing is known with certainty of their 
habits ; except that one of them has been stated by Sonnini to feed on berries, seeds, fruits, and insects, and, further, to 
reside in the solitary forests, living in troops in company with Toucans. 
1. I. aquilinus (Gmel.) PI. enl. 417. — Falco formosus Lath. ; 
F- nudicollis Daud. ; Ibycter leucogaster Vieill. Gal. des Oiseaux, 
t. 6. 
2. I. ater (Vieill.) Vieill. Analyse, p. 68., Gal. des Ois. t. 5. — Dap- 
trius aterrimus Temm. PI. col. 37. 342. ; Type of Daptrius Vieill. 
( 1816 ). 
3. I. fasciatus (Spix), Spix Av. Bras. t. 4. — Gymnops stngi- 
latus Spix, Av. Bras. t. 4. a. 
Milvago Spix. f 
Bill moderate, the culmen gradually curved to the tip, which is slightly hooked, the sides much com- 
pressed, and the lateral margins sinuated ; the nostrils exposed, rounded, with an elevated bony tubeicle 
1 8*4 EStabl ' Shed by VieiUot ( Anal y se > P-22.) in 1816, along with Daptrius which is coequal; as is also Gymnops of Spix (Av. Bras.), 
t s Pix in 1824 (Av. Bras. 1 . p. 12.) established this genus, for which three other names have been proposed, viz. Phalcobanus of 
MM - Lafr. et D'Orb. (Syst. Av.), 1837 ; Parasifalco of M. Lesson, 1837 ; and Senex of Mr. Gray, 1839- 
