The Tachinidae comprise a large diverse family of bristly flies with a postscutellum. They are parasitic on a variety of insect hosts including larval Lepidoptera, Symphyta, and Coleoptera. A number attack nymphal or adult Heteroptera or Coleoptera, and a few attack Orthoptera. There is perhaps no invertebrate group that is immune from attack, but the majority of hosts appear to be Lepidoptera larvae. More than 70 species have been collected at Cedar Creek, but the collection contains much undetermined material.
Many more species are likely to occur here.
Many of the ID's below must be considered tentative. Five subfamilies are recognized. The Phasiinae attack nymphal and adult Heteroptera and Coleoptera. Ormia attacks nocturnal Orthoptera. Myiophasia attacks weevil grubs.