Lasius umbratus workers are yellowish and rarely seen due to their underground habits. Unlike the common yellow ant Lasius flavus (Fabricius), L. umbratus workers have numerous erect hairs on their scapes and tibia. Queens are reddish brown and have heads that are broader than the maximum width of the alitrunk. Males are brownish black and have denticulate mandibles.
Throughout British Isles to central Scotland.
It occurs throughout Europe.