Fever-fly - Dilophus febrilis

Alternative names
Fever Fly

Length: 3.5 to 8 mm. Similar to the St Mark's Fly but not as hairy and with a ring of spines at the tip of the front tibia. The female has tinted wings - except for the tips, whilst the male has clear wings with a black stigma. Both males and females can be distinguished from other Dilophus species by having two rows of sub-medial spines on the front tibia, in addition to the apical ring. The lower row is usually just a single spine and generally on the dorsal side.

Identification difficulty

Female , Male


Around low vegetation.

When to see it

Found in spring to late summer peaking in April and May.

Life History

The larvae live underground and may damage plant roots.

UK Status

Fairly common and widespread throughout Britain.

VC55 Status

Fairly common in Leicestershire and Rutland.

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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