XIII. 
VOCAL MUSIC. 
57 
Ch 
j\ e °f another kind of grouse (Tetrao urophasianus), 
i t !" st courting the female, has his “ bare yellow oeso- 
n la S Us inflated to a prodigious size, fully half as large 
as file body;” and he then utters various grating, 
Fig. 39. Tetrao cupido : male. (From Brehm.) 
