Double Cicada Brood 2024 India. All of the periodical cicadas sharing the same life cycle that emerge together in a given year are called a brood, although any one species may be part of different. Periodical cicadas emerge on 13 or 17 year intervals, but offset depending on the location.

This spring, two broods of cicadas will emerge in the midwest and the southeast, in their first dual appearance since 1803. Maps of two cicada broods, reunited after 221 years.