If you'd like to learn more about these insects and their calls I recommend visiting www.songsofinsects.com and then taking to the forests and fields to enjoy these wonderful creatures for yourself.
Here is a cicada I happened upon shortly after it emerged from it's 2-5 years of feeding off of tree roots underground. Based on the cicada's I've been hearing in my north-central Pennsylvania area during the past couple of weeks there's a likely probability that this one was either a dog-day cicada or a Linne's cicada.
Here's a cicada in my hand. This is me showing you that you've nothing to fear from these strange creatures. They won't bite. Their straw-like mouthparts are made for drinking plant juices.
Here's the shed exoskeleton of a cicada that I photographed along the Diahoga Trail this-morning. Those who are familiar with the Diahoga Trail may be able to pinpoint the exact tree by looking at the background and find the shed exoskeleton for yourself!
Wishing you a fantastic multitude of wonderful buggy days in the months ahead.