👉 Trachypeneus is a genus of flies in the family Tympanidae, which includes the common fly T. subtilis, also known as the white fly. This genus contains over 30 species and ranges from small to large, ranging from the size of a pinball to the size of a cricket. The flies are typically found in gardens, parks, and other areas where they feed on caterpillars, grasshoppers, and other insects.