Dalmannia pacifica Fly, Fossil Butte National Monument, Wyoming. In hand sanitizer in a cuvette Ben added a piece of black construction paper on the bottom of the cuvette to decrease the reflectance of the cuvette wall, this worked, but the paper bled purple/blue..for an interesting effect. Many thanks to arbonius2 for the identification of this species, see their comments below regarding the interesting parasitic nature of this species of fly.
