INSECTS. 



325 



lodged in a furrow designed to receive it, and then draws 

 the leg briskly up and down. He does not play both 

 fiddles together, but alternately, first upon one and then 

 on the other." In many species the base of the abdomen 

 is hollowed out into a great cavity which is believed to act 

 as a resounding board. In Pneumora (fig. 15), a S. Afri- 



Fig. 15. Pneumora (from specimens in the British Museum). Upper 

 figure, male; lower figure, female. 



can genus belonging to the same family, we meet with a 

 new 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 wing- 



* Westwood, "Modern Classification," vol. i, p. 462. 



