108 

 RAPTORES. 



FALCONE)^. 



FALCONIDJZ. 





THE HEN HARRIER. 



Circus cyaneus. 



Falco cyaneus, Hen Harrier, 



Circus 



Buteo 

 Circus 

 Falco 



Busard St. Martin, 



PENN. Brit. Zool. vol. i. p. 239. 



MONT. Ornith. Diet. 



BEWICK, Brit. Birds, vol. i. p. 34. 



FLEM. Brit. An. p. 53. 



SELBT, Brit. Ornitli. vol. i. p. 68. 



JENTNS, Brit. Yert. p. 89. 



GOULD, Birds of Europe. 



TEMM. Man. d'Ornith. vol. i. p. 72. 



THE 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 



