Figure above :  Wing-venation of a number of representatives of the family Heleidae  ( = Ceratopogonidae)
      ( Nematocera).
      Reading from left to right and from top to bottom :
      49 -- Atrichopogon  rostratus WINN.
      50 -- Bezzia  ornata MEIG.
      51 -- Forcipomyia  ciliata WINN.
      52 -- Brachypogon  vitiosus WINN.