of the Genera Tetrao and Ortyz. 147 
to the north, it is more plentiful ; and itis occasionally seen on 
similar altitudes contiguous to the lakes of the Columbia. On the 
north-west coast it exists as low as 45°7’, the position of Mount 
Hood. This is the same bird as the Scotch Ptarmigan, and has 
beeu distinguished by Captain Sabine, in the Supplement to 
Captain Parry's First Voyage, as distinct from the next species. 
T. rupestris of Gmelin. I did not meet with this bird on the 
Rocky Mountains, and therefore suppose it is confined to the 
northern parts of the continent and the adjacent islands, from 
which it was brought in abundance by the officers of the diffe- 
rent Arctic Voyages.—For the differences between this and 
the preceding species, I refer to the accurate examination of 
Captain Sabine in the work above referred to, as well as to 
Mr. Sabine's Appendix to Captain Franklin's First Narrative. 
I am informed by Mr. Sabine, that this is the bird commonly 
met with in the northern parts of Europe, where it is erroneously 
considered as T. Lagopus, which species he believes to be ex- 
clusively confined to the mountains of — and to the 
northern pagis oh dubai drig (fat as bDescgguen s: 
T. Saliceti. This bird; so common in Hudson's Bay, appears 
rare in the Rocky Mountains. I saw only one pair there; it 
did not come under my notice on the north-west coast. 
T. Canadensis. As far as I know, this bird has not yet been 
found to the west of the central ridge of the continenti» A uer 
individual is occasionally seen contig 10 to: ern 
that ridge, near the sources of Athabasca —— in n 55° north lati- 
tude ; but the species does not become in anywise numerous until 
we reach the low woody countries in a similar parallel. About 
Lesser Slave Lake they abound, and on the woody plar e s of 
u 2 WES sien 
