1886. ] MR. R, COLLETT ON HYBRID GROUSE. 227 
In giving the following account of the “ Rype-Orre”’ I have had 
an opportunity of examining, besides the Norwegian specimens, the 
four specimens which at present (March 1886) are preserved in the 
Museum at Upsala, and which, by the kindness of Prof. Tullberg 
and Dr. Kolthoff, have been forwarded to me for examination. Of 
these specimens one is a male, namely Thunberg’s individual of 1808 
(see above), the other three are females. 
Besides these I have examined a fine male specimen in winter 
dress, captured in Wermeland (Sweden) in the middle of January 
1886, which I found myself in the game-market at Christiania in 
February last. 
Diagnosis and Configuration, 
Tail slightly forked ; number of rectrices 18 ; toes semiclothed, the 
outermost joints bare ; claws longand broad; bill stout ; eyebrows 
covered with warts, and pectinated above. 
Colour of male in winter dress: white underneath, with black 
feathers on the breast and flanks; blackish above, with whitish 
edges on all the feathers. A white band through the eye, and a 
blackish beneath it. Tail-feathers black, tipped with white. 
The female in winter dress more or less whitish underneath ; the 
back, breast, and flanks (sometimes the entire lower surface) trans- 
versely banded with reddish brown and black, all the feathers with 
whitish edges. Tail black, faintly speckled with brown and 
whitish. 
Bill rather like that of Tetrao tetrix, strongly built, but the culmen 
is not so plainly ridged as in that species; its size in the male is 
nearly double of that of Lagopus albus. The side branch of the 
mandible strongly developed. 
Eyebrows covered with numerous small red warts, and with a fine- 
toothed ridge above. The height of the eyebrows is about half the 
diameter of the eye; the comb im winter specimens is not very 
high. 
[oie shaped like those of Lagopus, long and broad, and very 
slightly oblique, the immer edge being a trifle broader than the 
outer. They are less curved than in 7’. ¢etrix, and their colour is not 
so dark as in that species. 
Toes semiclothed with hair-like feathers, densely in winter ; the 
innermost joint entirely feathered, the middle one naked above, but 
clothed on the sides, the outermost quite bare. The bare portions 
covered with horny rings, on the sides with one or two series of 
rounded scales ; under these there is a toothed comb (as in Zetrao, 
unlike Lagopus). 
Hind toe short, as in Lagopus (proportionally much longer in 
Tetrao). 
Tail slightly forked, the outermost feathers very slightly bent 
outwards at the end, and (in the male) 12 to 24 millim. longer than 
the centralones. Its length is proportionally longer than in 7’, ¢etriz, 
and more like that of Lagopus. 
Under tail-coverts slightly shorter than the central rectrices (or 
