RICHARDSON'S GROUSE. 99 



DENDRAGAPUS OBSCURUS RICHARDSONI. 



Geographical Distribution. — Eastern slopes of Rocky Moun- 

 tains, from Northern Wyoming, and Southeastern Idaho to the 

 Liard River, latitude 6i in British North America. 



Adult Male. — In general coloration this race resembles the 

 D. obscurus, or Dusky Grouse, but has a differently shaped tail, 

 which is much more square, and without any distinct terminal 

 gray band, merely an edging of pale brown; the feathers also 

 are much broader than those of the other two forms. In dimen- 

 sions there is little, if any, difference. 



Adult Female. — A specimen of this sex, which belonged to my 

 collection, and is now contained in the American Museum of 

 Natural History, number 2901, while resembling closely the 

 female of the Dusky Grouse on the upper parts, presents certain 

 differences beneath : it is much lighter upon the throat, being a 

 buffy white, speckled with brown, and there is a good deal of 

 white exhibited on lower breast, and on the flanks, the feathers, 

 which are slaty gray, being broadly tipped with this hue ; the 

 abdomen is slaty gray, the feathers only edged with whitish. 

 Tail has the median feathers broadly barred with buff, and all 

 are edged with whitish, the ground color being brownish black. 



