Mydas fly
 The Mydidae (alternative spelling Mydaidae) or Mydas flies are a small (fewer than 400 species) cosmopolitan family of rather large flies - including in fact the largest known fly Gauromydas heros (syn. Mydas heros). Many of the species in addition to their large size are mimics of stinging Hymenopterans especially wasps. They are most diverse and abundant in arid regions of the world but can be found in other habitats.