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.*^ 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. Pneumora (from specim' ns in thp Britisli Museum). Upper figure, male; 

 lower figure, female. 



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 



^2 Westwood, ' Modem (Classification.' vol, i. o. 462, 



