What's That Bug? does not endorse extermination

Big Winged Fly in Worm Bin
March 4, 2010
One of our customers has sent the attached photos of their worm bin.
The conditions in the worm bin are very wet, (muck like). These tiny, big winged flies are very numerous covering the surface of the worm bin. Red wigger worms are numerous also and seem not to be affected by the winged creatures. They look like alien flies. Please let us know what we have here.
Cathy’s Crawly Composters
Worm Bin

Moth Flies

Hi Cathy,
These are Moth Flies in the family in the subfamily Psychodinae.  There is an excellent close up photograph on BugGuide.  Certain species breed in drains indoors, and they are commonly called Bathroom Flies or Drain Flies.

What's That Bug? does not endorse extermination

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