There are different varieties. The annual cicadas emerge in late summer, in areas that have them. They're larger than the long-period cicadas, and have green eyes. The long-period cicadas (7 year, 13, year, 17 year, whatever) have red eyes and are usually far more numerous than the annual variety.
I was telling my husband about them this morning and at this point, with him bedridden, they can kill all they want to kill. I can barely keep up with all of the yard work now on this big old place and my son-in-law does most of it. I mow and take care of the yard around the house and he and my daughter take care of the other acreage.