I grew up in WV., and was there for at least one or two of the emergences of the 17 year "locusts" as we called them. Heres more info on Cicadas and their cycles. With charts of the different 17 year and 13 year "Broods":
http://insects.ummz.lsa.umich.edu/fauna/Michigan_Cicadas/Periodical/Index.html
