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A scorpionfly from the Miocene shales of Colorado, as the caption says in the Annual report of the Board of Regents of the Smithsonian Institution from June 30, 1953. I found it on archive.org.
Scorpionflies are still around. They’re related to fleas, and they don’t sting. As Wikipedia explains, “Mecopterans are sometimes called scorpionflies after their largest family, Panorpidae, in which the males have enlarged genitals that look similar to the stingers of scorpions.”
So. Um. Well.