Thaumatomyia notata


A very tiny (2.5 mm) yellow fly with dark stripes on the thorax. Note this is a tentative identification. Other chloropids, e.g. Chlorops pumilionis have similar markings on head and thorax and for this reason the image is placed in a red box.

Identification difficulty

Mainly in flower meadows but sometimes it enters homes in large numbers and for this reason has been nicknamed Yellow Swarming Fly.

When to see it

Spring and summer.

Life History

Larvae predaceous on aphids.

UK Status

Widespread in England and Wales, but difficulties of species identification means that true status is uncertain.

VC55 Status

Status in Leicestershire and Rutland is not known.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map