164 TETRAO TETRIX. 



nearly the same dimensions as in the Red Grouse. In the 

 plumage and colouring it was as exactly intermediate between 

 the two species as could be imagined. The imperfection of the 

 genital organs also corresponds with the idea of its being a hy- 

 brid. 



Hybrids are alleged to be occasionally produced between the 

 Pheasant and Black Grouse ; but I have not seen a specimen, 

 and were it not for Mr. Thompson's observations already alluded 

 to, should have imagined that the birds supposed to be of this 

 character were merely young Blackcocks, 



