Today’s moth is a beautiful species from the Rocky Mountains outside of Denver, Epermenia stolidota (Epermeniidae). This is actually a larger specimen than it appears, about 20mm from wingtip to wingtip. Those raised, darkened, tufts of scales on the posterior edge of the forewing is a great character for this family, as well as the stiff bristles on the hind tibia (also somewhat visible here). There are 11 species in 2 genera in the United States, with likely a few more to be discovered. Fellow curatorial assistant David Bettman keyed this species out using the revision of the Nearctic species: PDF here.