These insect fossils were on display at the American Museum of Natural
History (AMNH) in New York City in July 2018. They are called
Plecia sp. (Wiedemann, 1828)
aka Twist Flies
. The fossils were found in the Green River Formation at White Mountain, Wyoming, USA and
dates to the Eocene Epoch. Accession number is AMNH 28381.
Learn more about the museum at
https://www.amnh.org/