http://www.newsweek.com/facts-about-cicadas-brood-x-emerges-around-us-1586784

Trillions of cicadas are set to emerge from below ground in more than a dozen U.S. states in May and June, in a rare and remarkable natural phenomenon that promises to be both visually spectacular as well as an assault on the ears.

Brood X contains three species: Magicicada septendecim, Magicicada cassini and Magicicada septendecula.