HEN HARRIER. 101 
RAPTORES. FALCONID. 
THE HEN HARRIER. 
Circus cyaneus. 
Faleo cyaneus, Hen Harrier, Penn. Brit. Zool. vol. i. p. 239. 
55 wa 5 Pe Mont. Ornith. Dict. 
- ie 5 a Berwick, Brit. Birds, vol. i. p. 34. 
Circus 55 oS 3 Fem. Brit. An. p. 53. 
a Bs 5 - SELBY, Brit. Ornith. vol. i. p. 68. 
Buteo i a Jenyns, Brit. Vert. p. 89. 
Circus 4, a es Gou tp, Birds of Europe, pt. xi. 
Falco ,, Busard St. Martin, Temm. Man. d’Ornith. vol. i. p. 72. 
Tue decided difference in colour between the males and 
females of the true Harriers when adult is a subject now so 
well understood as to require to be noticed here only as a 
prominent illustration of one of the laws which appear to 
