Pest Guides

Yellow Swarming Fly

Thaumatomyia notata


Yellow Swarming Fly

  • The Yellow Swarming Fly is small - approximately 3mm in length (its size is similar to a fruit fly).
  • Adults are bright yellow with black longitudinal stripes on their thorax and black transverse stripes on their abdomen


  • Yellow Swarming Flies are often found hibernating in attics along with cluster flies.
  • The larvae of Yellow Swarming Flies feed upon aphids associated with grass roots.


  • Yellow Swarming Flies are often found in large numbers in roof voids in Autumn where they over–winter.
  • In the spring season, they can be encountered feeding on nectar of flowers and various sweet liquids and excretions.