One of two large metallic green Lasioglossum bees in Britain. This species has a rather blue-green sheen over both the thorax and abdomen which can often be discerned in the field. Although these features often serve to distinguish it from the similarly green L. morio and L. leucopus, separation from the closely related, but more northerly and westerly distributed, L. cupromicans requires considerable care and microscopic examination.
Restricted to southern England, Channel Islands, Wales and north to Northumberland. It is gradually replaced by the closely related L. cupromicans towards the north, and in upland situations, particularly in the South-west. The species has a generally Mediterranean and Atlantic distribution in Europe. It is also known from north Africa.