598 ON THE HYBRID GROUSE. 
“The first six primaries are black-grey, with lighter speck- 
lings on both webs. 
“The white base of the primaries begins at the sixth and 
goes back to the sixth from the last. 
“When the wings are folded nothing of the first white 
bar is seen, and of the second little, only about two lines. 
“The ground-colour of the lower back is pure black with 
hardly any sheen, traversed by broad pale rust-coloured bars.” 
This precise comparison is very instructive, and ought to 
be of material assistance in the elucidation of this question. 
Full attention must now be devoted to the Hybrid Hen, and 
the habits of both sexes of this cross ought to be studied as 
closely as possible. It is unfortunately but little that I have 
been able to contribute to the subject, but I believe that the 
discovery of these two new forms of Tetrao medius may tend 
to slightly advance the solution of this highly interesting 
problem. 
