Order - Diptera - Flies Family - Tachinidae - Parasitic Flies   Sub-Family - Tachininae 5 October 2017 At Mercur, Tooele County, Utah Home      Insects       Details           Photo Details - ©Nicky Davis Photographed 5 October 2017 at Mercur, Tooele County, Utah Identified by Bug Guide These are parasites of Lepdoptera and other insects.