INTKODUCTION. 
L Y R U R U S, 
WITH THE EOLLOWIKG CHAEACTEKS. 
Bill stronq. Wings moderate; the third quill longest. JMl verij much forhed ; exterior feathers curved outwards. Tarsi feathered. 
12. LYEURUS TETRIX, 
Plate XII. 
For the next species I propose to employ Swainsoii’s term of 
CEYTROCERCUS, 
WITH THE FOLLOWING CHAEACTERS. 
Bill comijressed. Base of culmcn prolonged towards the crown of the head^ dividing the frontal feathers. Tail long, of twenty feathers, 
which are lanceolate and pointed. 
This bird is an inhabitant of the desert plains of western North America, and lives upon the Artemisia, which abounds in 
those regions. 
13. CENTROCERCUS UROPHASIAXUS, Plate XIIL 
The next two species I include in the genus iustiuited by Prof Baird, 
PEDIECRSTES, 
WITH THE FOLLOWING CHARACTERS. 
Bill strong, moderate. Neck destitute, of lengthened feathers. Wings short, rounded. Tail short, graduated, the upper middle coverts 
extending beyond the tail. Tarsi feathered to the base of the toes. 
The Sharp-tail Grouse are dwellers of the plain, and are found in large flocks upon our western and northern prairies. 
They are. 
14. PEDIEC^TES COLIIMBIANUS, 
15. “ PHASIAXELLES, 
Heariie says of this last species; “These birds are always found in the southern part of Hudson’s Bay, and are very plen- 
tiful in the interior parts of the country, and in some winters a few of them are shot at York Port (lat. 57° north), but never 
reach so far north as Churchill. In color they are not very unlike the English hen-pheasant, but the tail is short and pointed, 
like that of the common duck; and there is no perceivable difference in plumage between the male and female. 
Plate XIY. 
Plate XV. 
