FALCONID A. — AQUILINEA. 207 
the upper mandible hooked, and very acute, with a 
tooth, or festoon, towards the end on each side, or with 
the cutting margin sinuated. Claws considerably 
curved, retractile, and very acute. 
Susram. AQUILINA. Lagles. 
Size large. Body strong, robust, muscular ; somewhat 
heavy. Jill rather straight at the base, but curved 
towards the end. Wings more or less lengthened ; 
the three first quills graduated. Feet very strong and 
muscular: the tarsus more or less plumed: the claws 
large, and much curved. ~ ie 
Panpion, Savigny. Bill rather short, rounded above, 
curved from the cere: the cutting margin of the 
upper mandible with a slight festoon in the middle. 
Nostrils small, obliquely transverse. Wings length- 
ened ; the second quill longest. Legs naked: tarsi 
entirely covered with small reticulated scales. Toes 
unconnected; the exterior somewhat versatile. Claws 
nearly equal, rounded beneath. 
P. halizetus.* Sav. Europe. Americanus. Wils. 37. 1. 
Aeuita. Wings lengthened (the first quill short, the 
fourth and the fifth the longest, Tem.). Tarsus plumed 
almost to the toes. Head not crested. Inhabits chiefly 
the Old World. 
+ A.imperialis. Tem. Man. 37. pennatus. Tem. Man. 43. 
chrysetos. Pl. Enl. 410.  albicilla. Selby, i. pl. 3. 
nevius. Tem. Man. 43.  leucocephalus. Wils. 36. 
: ‘ oe 
Harpyia, Cuvier. Wings 185 OZ 
rather short. Tarsus more 
lengthened, and generally 
naked. Head crested. In- 
habits the tropics of both 
the Old and the New World. 
* So far as I can judge from figures and descriptions, I am disposed to 
consider the genera Dedelion, Hamatornis, and some others, to be secondary 
forms, or subgeneric types. Not having them before me, I have not ven- 
tured to adopt them. I wish, in fact, that this arrangement of the Falconide 
should be looked upon as merely temporary, being now engaged on a more 
minute investigation of the whole family. 
¢ These European species are inserted on the authority of the Manuel 
@ Ornithologie, 2d ed. 
