246 



Bill: culmen not so plainly ridgecl as in Tetrao tetrix; the 

 side branch of the upper mandible strongly developed. The lower 

 mandible considerably smaller than the upper, (as in Lagopus). 

 Eyebrows with numerous small wart like skin-laps, and finely 

 toothed above. 



Male in winter dress, Nov. — March. 



Bill black. 



Head black and white. The white is a broad band, passing 

 in front of and through the eye, and terminating above the ear- 

 coverts in the direction of the neck. The black is a broad band, 

 which encircles the upper and lower mandibles, expands beneath 

 the latter into a black patch on the gorge, about the length of the 

 bill, stretenes under the eye, covers the ear-coverts, and extends 

 under the white band raentioned above down to the end of the neck. 

 This band however is seldom entirely black, the feathers being more 

 or less tipped with white. Front and croivn of the head black 

 sprinkled with white. 



Eyebrows bright vermillion, with numerous small wart-like 

 protuberances ; above slightly toothed. Their total height (at 

 the end of winter) is 11 mm 5 of which 4V 2 mm forms the toothed 

 co mb. Eyelids white. 



Neck, like the back, rump, and crown of the head, deep black, 

 the margin of the feathers being sprinkled with white; it 

 has, however, a somewhat lighter appearance, from the greater 

 thickness of the plumage here. A few feathers entirely black are 

 interspersed at intervals. 



I(acJc and rump black, the outer part of the feathers sprinkled 

 with white. Below these whitish tips, however, in most of the in- 

 dividuals, there is a broadish space, on which can be traced almoflt 

 obsolete transverse bands, specklcd with reddish-brown ; it is, 

 however, frequently concealed by the overlapping feathers, and not 

 easy to discover in all individuals. 



Inter scap ul a ry region much the same as the back; a few 

 feathers entirely white, entirely black, or black interspersed with 

 broad white edges. 



