''Lasius brunneus'' is a species of ant in the genus '' Lasius''. The species is widely distributed in Europe, from Sweden in the north to Anatolia in the south. In England this species is almost always found nesting in oak trees or rotting wood mainly foraging in trees but has also been found under stones and foraging on the ground. It is thought to be underrecorded but is fairly common especially in the South East. Workers are easy to identify as they are bicoloured, but they can be confused with ''

Lasius emarginatus ''Lasius emarginatus'' is a species of boreal formicine ants. Description ''Lasius emarginatus'' is a small ant, reaching a length of 3–5.5 mm in the workers, 7–10 mm in the females and 7–14.5 mm in males. In workers and f ...

''. Nuptial flights have been recorded as early as May on warm days from early morning to early afternoon. Queens are smaller than other ''Lasius'' species, mainly a uniform dark brown colour with a flattish, slim appearance.

References

brunneus Hymenoptera of Europe Insects described in 1798 {{Formicinae-stub