Photos

17-year cicada in summer of 2004. Next appearance will be in 2011. Oops, I meant 2021 (Aleksandar. thanks for pointing that out)

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"While the familiar green-and-black Dog-Day Cicadas are present every July and August in small numbers, the Periodical Cicadas appear, simultaneously, only once in seventeen years in any given area. Periodical cicadas do not emerge everywhere at the same time. Twelve broods of 17-year cicadas appear in different areas of the northeastern U.S. in different years, emerging from late May through June. Their bright red eyes and reddish markings distinguish the Periodical Cicadas from the Dog-Day Cicadas which emerge later in the summer (July through August) and have green markings. Each brood actually consists of up to three separate species which all emerge together. Each looks slightly different and the males of each species court their ladies with a different serenade. If a human takes the time to listen and try to sort out what seems to be cacophony, he or she can easily distinguish these three songs."

Source: http://biology.clc.uc.edu/steincarter/cicadas.htm