IXSECTS. 



259 



those familiar forms which have no other common name 

 than ' stink-bug.' No one who has ever taken into his 

 mouth a berry over which one of these animals has trav- 

 elled can doubt the appropriateness of the name. How- 

 ever, these bugs are not alone in their malodorous qualities; 

 many others, like the squash-bug and bedbug, also secrete 

 a strong-smelling fluid, which of course protects them 

 from birds and other insect-eating animals. 



Among the HOMOPTERA the cicadas come first. One of 

 these, the 'dog-day locust' (it is not a locust at all), is 

 familiar from its shrill note heard during the hottest 

 days of summer. This form requires two years to come 



FIG. 79. Seventeen-year locust (Cicada septendecim). From Riley. a, pupa; 

 b, pupa-case from which the adult, c, has escaped; d, twig bored for the 

 deposition of eggs. 



to its full maturity, but its cousin, the seventeen-year 

 locust (fig. 79), requires, typically, seventeen years from 



