Hylaeus annularis auct.
Previously known as Hylaeus annularis (Kirby, 1802) - see recent name changes. British representatives of the subgenus Lambdopsis are restricted to Hylaeus dilatatus and H. annularis (formerly H. spilotus).The females of both differ from other British Hylaeus in the reduced, circular (not wedge-shaped or linear) paraocular markings; the males have greatly dilated, yellow and black-marked, sub-rectangular antennal scapes (easily visible to the naked eye).
Widely distributed, though local, in southern England; the range extends north to the Midlands (Leicestershire). In Wales, only recorded from South Glamorgan (Hallett 1927). There are no records from Scotland, Ireland or the Channel Islands. The species is found throughout Europe and east to Anatolia and the Caucasus (Koster 1986).