Yes, the ID challenge today is an actual insect, for once. And, as a clue to identity, consider first the point that it only has a single pair of wings, rather than the more usual complement of two.
Attribution to follow.
Update: Identity now available here. Figure from MacLachlan (1868).
Lithostratigraphy and biostratigraphy of the Chinle Formation in Lisbon Valley, Utah
13 hours ago in Chinleana