These slender-bodied flies sort of look like thread-waisted wasps (Specidae) at first glance. Like other tachinid flies, they are internal parasitoids of other insects, feeding inside their host and avoiding vital organs until the last stage of development …ultimately killing them. For this particular species, stink bugs (Pentatomidae) are on the menu. Adults are common visitors to flowers in open weedy areas throughout the summer. This species is holarctic, including most of North America.
Photo by Glenn Marangelo on 8/16/20 in Condon, MT.