MONOGRAPH OF THE FALCONID A, 
SYSTEMATICALLY ARRANGED BY 
Dr. T. T. KAUP.* 
IV. ORDO ICHTHYORNITHES. 
A. Suborder Accrprrres, Linn. 

THE nostrils are situate in a cere, the upper mandible curved 
and hanging down over the under; the toes not webbed, with 
long curved claws. There exist five families— 
I. Falconide. I. Strigide. IIT, Gypogeranide. IV. Gypaétide. 
V. Vulturide. 
‘I. Family Fanconipm. Faxco. Linn. 
The eyes sidewards; the toes never feathered; middle toe never 
thrice as short as the tarsus; cere naked or visible through the 
plumage; head and neck feathered. i 
A. Subfamily Fancoyina. 
1, Hreérax. 2. Tinnuneulus. 8. Harpagus. 4. Falco. 5. Ieracidea. i 
In this subfamily the typical genus is Héérax, with the largest 
and roundest head, with the largest brain; the socket of the eye 
nearly closed, and the nostrils bored in the nasal bones. 
* Continued from p. 121-34 of 1849, 
bl 

