11. SYNOPSIS. 



nostrils near the middle of the bill, longitudinal, lateral, 

 pervious, placed near the ridge, sometimes surmounted by 

 fleshy appendages: feet naked, slender, middle toe long, 

 united at the base to the outer one : wings slightly acumi- 

 nated; the first quill short, the third longest. 



C. Percnopterus, Temm. v. i, p. 3 



Gen. j. FALCO. Head covered with feathers: bill 

 hooked, generally curved from its base, cere more or less 

 hairy; upper mandible furnished with one or two teeth; 

 lower mandible slightly rounded and emarginated: nostrils 

 round or oval, placed in the cere: feet covered with scales, 

 or feathered to the toes ; the outer toe generally united at its 

 base to the middle one; claws much hooked. 



Division i. Bill short, curved from its base; upper man- 

 dible strongly toothed; lower one emarginated: legs robust, 

 toes long and strong; claws much hooked and sharp ; tarsi 

 short: first and third quills of equal length, second longest. 

 F. Grcenlandicus, Linn., Hancock. \. i, p. 8 



F. Islandicus, Lath., Hanc. 



F. Lanarius, Linn. - v. i, p. 10 



F. peregrinus, Gmel. - v. i , p. 1 1 



F. Subbuteo, Linn. v. i, p. 13 



F. ^Esalon, Gmel. - \. i, p. 15-17 



F. Tinnunculus, Linn. - v. i, p. 18-20 



F. rufipes, Bechstein. 



Division 2. Bill strong, rather long, not bent from the 

 base: tarsi naked or covered with feathers; feet and toes 

 robust; claws strong and much curved: fourth and fifth 

 quills longest. 



F. fulvus, Linn. v. i, p. 21-23 



F. naevius, Linn. 



F. Albicilla, Linn. - - v. i, p. 25-27 



F. Haliaetus, Linn. - v. i, p. 29 



Division j. Wings short, reaching to nearly half the 

 length of the tail; fourth quill longest: bill short, bending 

 from the base: tarsi and toes long; middle toe longest. 



