388 ON THE BIRDS 



Europe. Leaving aside the two that are common to both, 

 and the respective Bonasix, we may draw the following pa- 

 rallel between the remaining species of the two worlds. The 

 cock of the woods, or capercailzie of Europe, ( T. urogallus) 

 corresponds to the American cock of the plains, (T. uropha- 

 sianus). The black game, ( T. tetrix) finds its equivalent in 

 the dusky Grouse, (T. obscurus). The T. hybridus or me- 

 dius, has no analogue in America; neither has T. scoticus. 

 They are however more than replaced as to number by T. 

 phasianellus, T. eupido, and T. canadensis, all American spe- 

 cies, that have none corresponding to them in the Old world. 

 Being perhaps the only naturalist who has seen all the 

 known species of Grouse of both continents, having enjoyed 

 the advantage of examining many specimens even of the rar- 

 est, and possessing them all but one in my own collection, I 

 I am peculiarly well situated for giving a monography of this 

 interesting genus. Such a work it is my intention to publish 

 at some future period, illustrated with plates, and accompanied 

 by further details of their habits. They are all found in Eu- 

 rope and North America, some of the European occurring also 

 in Asia, from whose elevated central and northern regions, 

 as yet unexplored, may be expected new species that still 

 remain to be discovered. The extensive wilds of North Ame- 

 rica may also furnish others ; but we do not think it probable ; 

 for since we have become acquainted with both sexes of T. ob- 

 scurus, and T. urophasianus, we are not aware of any indica- 

 ted in the accounts of travellers that cannot be satisfactorily 

 referred to known species. 



