374 DUSKY GROUSE. 
America, each and all distinct from the three European. Of 
the two Bonasiw, one is peculiar to the old, and the other 
to the new continent, the former having sixteen, the latter 
eighteen feathers to the tail. hus the entire number is seven 
in Europe, while it is eight in North America. Setting aside 
the two common to both, and the respective Bonasice, we 
may consider the cock of the woods of Europe as the parallel 
of the cock of the plains of America. The black grouse, 7’ 
tetria, will find its equivalent in the dusky grouse, 7’. obscurus ; 
but the 7. hybridus has no representative in America, any 
more than the 7. Scoticus, These, however, are more than 
replaced as to number by the 7’. phastanellus, 7. Cupido, and 
T. Canadensis, all American species, which have none corre- 
sponding to them in the old world. 
Perhaps no other naturalist has personally inspected all the 
known species of this genus of both continents, and having 
examined numerous specimens even of some of the rarest, and 
possessing all but one in my own collection, my advantages 
are peculiar for giving a monography of this interesting genus. 
Such a work it is my intention hereafter to publish, illustrated 
with the best figures, and accompanied with further details 
repecting their habits. In the meantime, I shall merely 
state, that, being replaced in Africa by Péterocles, and in South 
America by Tinamus, all the known species of grouse are 
found in North America or in Europe, the European also 
inhabiting Asia, from whose elevated central and northern 
regions, yet unexplored, may be expected any new species 
that still remain to be discovered. The extensive wilds of 
North America may also furnish more, though we do not 
think so; for since we have become acquainted with both 
sexes of the dusky grouse and the cock of the plains, we have 
been able to refer satisfactorily to known species all those of 
which any indications occur in the accounts of travellers in 
this country. 
North America is exceeded by no country in the beauty, 
number, and valuable qualities of her grouse; and she is even 


