Indiana Brood X cicadas' butts may fall off due to fungus containing psychedelic drugs.

It sounds like a twisted mix of “Invasion of the Body Snatchers” and a Grateful Dead show. But John Lill promises that it’s all too real.

This month, as billions of Brood X cicadas emerge from the dirt in Indiana and more than a dozen other states for the first time in 17 years, some of the bugs will suffer a horrific, science-fiction-like fate. There’s no delicate way to do this, so here’s the gist all at once.

A fungus laced with the same chemical as psychedelic mushrooms will invade their bodies and eat away their insides until their abdomens crack, fall off and get replaced with a ball of white spores. Because they’re either bombed on psilocybin or under the control of the fungus in some other way, the cicadas won’t even notice. With missing butts and full hearts, they’ll forge ahead with their only reason for existing: finding a mate and reproducing.

“Really what they’re doing is spreading these spores all over the place,” said Lill, a cicada expert and chair of biology at George Washington University. “It’s a sexually transmitted fungus. They engage in normal courtship behavior, yet their abdomen is a big fungal mass. Instead, the attempted copulation results in spreading the fungus even more.”

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