372 



The Descent of Man. 



Pakt II. 



male of another kind of grouse (Tefrao urophasianus), whilst 

 courting the female, has his " bare yellow oesophagus inflated to 

 " a prodigious size, fully half as large as the body ; " and he 

 then utters various grating, deep, hollow tones. With his neck- 



feathers erect, his wings lowered, and buzzing on the gound, 

 and his long pointed tail spread out like a fan, he displays a 

 variety of grotesque attitudes. The oesophagus of the female is 

 not in any way remarkable.*^ 



*' Richardson, ' F.iuna Bor. American : Birds,' 1831, p. 359. Audubcu 

 bid. vol. iv. p. 507. 



