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.
Description: English: Dalmannia picta. Date: 1888, 1896, 1908. Source: Illustration from Manual of North American Diptera (1888, 1896, 1908). Author: Samuel Wendell Williston (1851, 1918).
Description: 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. Date: 24 October 2012, 16:58. Source: Fly yellow, side, Fossil Butte_2012-10-24-11.27 Uploaded by Jacopo Werther. Author: USGS Native Bee Inventory and Monitoring Laboratory from Beltsville, USA.