Violet Black-legged Robber Fly - Dioctria atricapilla


Length: 10-12mm. This is an all blue-black robberfly with bright yellow halteres. It is the only Doctria species with all black legs. Males have prussian blue eyes. The wings are darkened towards the base, particularly in the male. The female has a golden face whereas in the male it is dark brown.

Identification difficulty
Recording advice

Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.


Around grassland where it usually rests on grass stems and sometimes in woodland rides.

When to see it

May to July.

Life History

Predatory on small insects, particularly other flies and parasitic hymenopterans.

UK Status

Widespread in the southern half of Britain.

VC55 Status

Status in Leicestershire and Rutland 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