ANIMAL BEHAVIOR, WITH EXAMPLES 



217 



The Dog-day Harvest-fly, Cicada, or Lyreman (Cicada tihicen), 



just emerged from the -pupa, seen below. The shrill piercing 



notes are produced by the rapid vibrations of a pair 



of membraneous coverings of two kettle-drums on 



the underside of the base of the abdomen. 



