Little known fact, Chinese herbal medicine has used cicada shells to reduce body temperature, such as fever, and as an anticonvulsant. You can check out more facts at this sight for Traditional Chinese Medicine Cicada Molting.
In Greek mythology they were seen as the spirits of musicians who were playing for the Muses and died. The Muses made them into cicadas that could sing from birth until death without eating or sleeping. Aristotle is credited with making cicadas into symbols of resurrection and immortality.
In the town of Tsurugi, here in Ishikawa Japan, people ate the little white threads in the cicada shells as a snack before the introduction of modern snacks 60 years ago.