Juriniopsis adusta

Juriniopsis adusta is a heavy-bodied bristle fly with a lustrous dark abdomen armored in stiff, upright spines. Adults spend warm sunny afternoons visiting open blossoms like goldenrod and boneset, serving as active pollinators while sipping nectar. Females lay tiny eggs on foliage, where microscopic larvae lie in wait to latch onto passing caterpillars and develop internally as parasitoids.