Periodical Cicada 



Tibicen septendecim Linn. 



1 Insect six minutes later than in plate 20, fig. 6, 9:51 



2 Insect one minute later, 9:52 



3 Insect one minute later, 9:53 



4 Wings fully developed and partly wrapped around the body 



5 Cicada fully colored as it appeared the next morning 



6 Cicada with ovipositor partly inserted in a twig 



17S 



