582 . NOTES ON THE 
The external and less important dimensions are not so 
variable in proportion ; but I am only able to give those of 
two of the cocks that I measured :— 
Length. |Breadth.) Wing. | Tail. | Beak. | Tarsus. | Middle toe. 
cm. cm. cm. cm, cm. cm. cm. 
I. ..| 75:2 | 117-1] 35 29 4:3 46 6 
II. ..| 70-5 | 109-2) 33-2 | 21:5 41 62 6 
I was fortunate enough to observe and kill two Hybrid 
Cocks. The first I bagged in Southern Bohemia in a per- 
fectly flat boggy district, only varied by a few small woods 
among the fields. There the heaths and moorlands were well 
stocked with Blackgame, but no Capercaillie were to be 
found nearer than the thick woods a good many miles away. 
This Hybrid Cock which had there taken up its position, 
went about with the Blackcocks all day long, drummed at a 
considerable distance from a little fir-wood upon the place 
frequented by those birds, and visited the fields in the evening. 
I had, however, but little opportunity of studying it, as I 
killed it by a chance shot a few hours after my arrival in that 
district. 
I therefore unfortunately missed the sight of a Hybrid 
Cock drumming on the ground like a Blackcock; but on a 
second occasion, when in Northern Bohemia, I was more 
successful, This bird, which the keepers had long known of, 
drummed on a tree just like a Capercaillie, and in a wood 
not frequented by that species. After I had waited a long 
time, and the sun had already risen, the cock at last began to 
sing, at first low, then loud, the pitch of its song resembling 
neither that of the Capercaillie nor the Blackcock, but in its 
rhythm and its divisions reminding me of the former, while 
the “ Glocken” or “ Zihlen” was represented by a “kra, kra,” 
