38 CLASS AVES. * 



of the bottom of the neck of the male erect them» 

 selves like two little pointed wings. Inhabits the 

 plains. The male has under the little tippets of the 

 neck a naked skin, which is inflated like a bladder 

 in the breeding season. His voice is like that of a 

 trumpet. It is most excellent game, for the pre- 

 servation of which laws have been made in certain 

 states. 



Dusky GrouSf Tetrao Ohscurus, Say. Pr. Musig. 

 Am. Orn. iij, t. 18. « 



Tail slightly rounded of twenty broad rounded 

 blackish feathers ; primaries, spotless ; male, black j 

 female and young, dusky, somewhat mottled. Rocky 

 Mountains. Size, and allied to, T. Tetrix, 



We insert in the text of Cuvier the following : 



Cock of the Plains. Lewis and Clark. 473. Tetrao 

 Orophasianus. Bonap. t. 21. f. 1. ^ 



Brownish-grey, waved, with black and ferrugineous ; 

 throat and belly, black ; chest, wliite ; beneath, black 

 band ; feathers on the sides of the neck, lengthened 

 brown ; tail, cuneate of acute rigid feathers. Female, 

 brownish-grey, black and white waved; belly, black ; 

 cheek, white, black banded. North America. 



Tetrao Urophasianellus. 

 Douglas. Lin. Tran. 



Brownish-grey, waved with white, black, and ferrit- 



