Chap. X. 



Orthoptera. 



287 



and remarkable modification ; in the males a small notched 

 ridge projects obliquely from each side of the abdomen, 

 against which the hind femora are rubbed. 42 As the male is 

 furnished with wings (the female being wingless), it is re- 

 markable that the thighs are not rubbed in the usual manner 

 against the wing-covers ; but this may perhaps be accounted for 

 by the unusually small size of the hind-legs. I have not been 

 able to examine the inner surface of the thighs, which, judging 



Fig. 15. Pnetrmora (from specimens in the British Museum). Upper figure, male; 



lower figure, frniale. 



from analogy, would be finely serrated. The species of Pneumora 

 have been more profoundly modified for the sake of stridulation 

 than any other orthopterous insect ; for in the male the whole 

 body has been converted into a musical instrument, being 



42 Westwood, ' Modern Classification.' vol, i r>. 462, 



