Clearly one of the Lasioglossum calceatum group of bees, although it is fairly large for the genus, with males and females about 8 mm long. Females have mid-brown abdomens with paler apices to the segments; the males are similar, but also have red-brown markings on the anterior tergites of the abdomen. The species may abound within its very restricted range, creating very large nesting aggregations.
Very restricted in Britain, being found only on the unstable sea cliffs of South Devon and Dorset. It is widely distributed throughout southern and central Europe.