374 



THE DESCENT OP MAN. 



(d, e, f) in the female. Even the bones of the wing, which sup- 

 port these singular feathers in the male, are said by Mr. Eraser 

 to be much thickened. These little birds make an extraordinary 

 noise, the first "sharp note being not unlike the crack of a whip."' 



Fig. 45. Secondary wing-feathers of Pipra deliciosa (from Mr. Solater, 

 in 'Proc. Zool. Soc' 1860). The three upper feathers, a, b, c, from 

 tlie male; the three lower corresponding feathers, d, e, f, from the 

 female. 



a and d, fifth secondary wing-feather of male and female, upper 

 surface. 



b and e, sixth secondary, upper surface, c and f, seventh secondary, 

 lower surface. 



s' Sclater, in 'Proc. Zool. Soc' 1860, p. 00, and in 'Ibis,' vol. iv. 1862, p. 

 175. Also Salvin, in 'Ibis,' 1860, p. 37. 



