358 
SEXUAL SELECTION. 
Part IL. 
in the male tlie whole body has been converted into a 
musical instrument, being distended with air, like a 
great pellucid bladder, so as to increase the resonance., 
Mr. Trimen informs me that at the Cape of Good Hope 
these insects make a wonderful noise during the night 
Fig. 14. Pneumora (from specimens in the British Museum). Upper figure, male-;, 
lower figure, female. 
There is one exception to the rule that the females* 
in these three Families are destitute of an efficient 
musical apparatus ; for both sexes of Ephippiger (Lo~ 
custidie) are said 40 to be thus provided. This case may 
40 Westwood, ibid. vol. i. p. 453. 
