Lasius meridionalis is a rare, small yellow ant superficially similar to the common L. flavus (Fabricius). It can be difficult to separate it from the similar L. mixtus (Nylander), L. sabularum (Bondroit) and L. umbratus (Nylander). It is a temporary social parasite.
There are coastal records for South Wales, south-east and eastern England, also inland for the home counties and the Breck.
It is found in northern and central Europe.