Periodical Cicada 



Tibicen septendecim Linn. 



1 Emerging insect two minutes later than plate iS, tig. 6, 10:13 



2 Emerging insect one minute later, 10:14 



3 Insect crawling from the shell, 10:35 



4 Insect resting on the empt}- shell, 10:36 



5 Insect hanging beside the shell, 10:42 



6 Insect hanging from the pupal shell. Note padlike wings, 9:45 



176 



