I 



I'I.ATK 29. A. Male (upper figure) and female (lower figure) of seventeen-year cicada (Cicada, 

 septendecini), often inaccurately called "seventeen-year locust." x. Stridtilating organ of the male. 

 It is absent in the female. B. Males and female (middle figure above) of staghorn beetle (Lucanus 

 dania). These figures illustrate not only the difference between the sexes, but also the variation in 

 size among the males. 



