Monsoon season in arizona. what are insects that come out of a shell, fly in trees and buzz?

Question

their empty shells can be found on fence posts, tree trunks etc. The insect that crawls out, hang out on tree braches and buzz very loudly, continuously. they are annual, here in phoenix arizona. Then their dead bodies are found everywhere towards the end of summer. What are they, and what is their life span?

Answer 1

Locus

Answer 2

cicadas.  11-years

Answer 3

they are in fact cicadas.