Negro Ant - Formica fusca


This wood ant is dark brown to black in colour. The worker can be up to 6mm long.

Similar Species

This species is very similar to Formica lemani, which can be differentiated from F. fusca by the presence of short, stubby hairs on the promesonotal dorsum.

Identification difficulty
Recording advice

Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.


F. fusca nests are usually found in rotten tree stumps or under stones in clear cut areas and along woodland borders and hedgerows.

When to see it

All year with winged forms appearing in June and July.

Life History

Food includes small insects and aphid honeydew. There are rarely more than 1000 in a colony.

UK Status

It is mainly found in southern and central England.

VC55 Status

Appears to be localised in Leicestershire and Rutland.

be our species champion

Leicestershire & Rutland Map


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

UK Map