AVES. 
165 
Falco cyaneus. — The Hen-Harrier. 
Plate XXXVII. fig. 3. 
Upper parts bluish-gray, under parts pure white; without 
spots or streaks ; quills black ; legs and toes lemon yellow. 
Length eighteen inches. Inhabits Europe and America. 
Sub-Genus 6.— Caracar^e. —Cheeks and throat naked. 
Falcoformosus. — The Red-Throated Falcon. 
Plate XXXVII. fig. 4 
Upper parts dark liver-coloured brown; abdomen Indian red ; 
throat purple; cere, orbits, and feet, dull yellow. Eighteen 
inches long. Inhabits South America. 
Sub-Genus 7_ Cymindi. — Tarsi short, toes semi-webbed. 
Falco uncinatus. — The Hooked Eagle. 
Plate XLVI. fig. 3. 
Lead-coloured above, paler below ; quills with fillets of dark 
brown •, base of tail white; beak considerably hooked. Fifteen 
inches long. Inhabits Brazil. 
Genus 10. — STRIX.— Linnceus. 
Generic Character. —Beak compressed, bent from its origin ; 
base surrounded by a cere, covered wholly, or in part, by stiff, 
erect hairs; head large, much feathered; nostrils lateral, 
rounded, open, pierced in the anterior margin of the cere, con¬ 
cealed by hairs directed forwards ; eyes very large ; orbits sur¬ 
rounded by feathers; legs feathered, frequently to the talons ; 
feet with three toes before and one behind, separate; the ante¬ 
rior reversible ; first quills dentated on their anterior border, the 
third longest. 
Sub-Genus 1.— Noctua. — Savigny. —"Without tufts on tue 
head; ears small; disc of feathers surrounding the eyes, small. 
