- 1/8" in length. Yellow–brown or mottled in colour with bright red eyes.
- Abdomen hangs down in flight, which is slow.
- Tend to hover.
- Develops to adult in 7–30 days.
- Adult lives 2–9 weeks.
- Breeds in fermenting residues found in pubs, fruit & vegetables, breweries, etc.
- May also breed in unclean drains and cleaning utensils.