127 Magicicada Brood X, East Coast, U.S. 2021, 2038, 2055, ... Here's a sight you'll have to wait until 2021 to see: the emergence of the Magi- cicada periodical cicada along the eastern coast of the U.S. And if you miss it in 2021, then your next chance won't be until 2038. Of course, if you're squea- mish, you might want to avoid the emergence of the entire cicada population altogether--a cicada is a large, flying insect, and even though it doesn't sting or bite, it has a nasty habit of treating humans as a suitable landing place. Cicadas are found all over the world, and most come out of hiding each year.