CIRCUS. 123 



Genus CIRCUS. 



The genus Circus Avas established by Lacepede (Mem. Classe So. math.- 

 phys. Inst. iii. p. 506) in the year 1801. Previous to that date the 

 Harriers were included in the genus Falco of Linna2us. Lacepede did 

 not indicate any type; but Bonaparte, who afterwards unnecessarily sub- 

 divided the genus, retained the j\Iarsh-Harrier in his restricted genus 

 Circus, and this bird may therefore be considered the type. 



The Harriers are intermediate between the Buzzards and the Hawks, 

 having the somewhat long wings and short tarsus of the former, and 

 the long tail and slender tarsus of the latter, but agreeing with both 

 in having the lower half of the tarsus seutellated both at the back and 

 front. 



This genus is almost cosmopolitan, and contains about twenty species, 

 of which four are European, three of these breeding more or less commonly 

 in the British Islands. 



The food of the Harriers is composed of small mammals, birds, reptiles, 

 fish, insects, and birds' eggs. Their nests are built on the ground; and 

 their eggs, from three to five in number, are bluish white, generally 

 spotless^ but in some cases marked with pale brown ; when held up to the 

 light the bluish-green colour which underlies the white ground-colour is 

 always observable. 



