With a body length of up to 20 mm in both sexes this is an enormous halictid and one of the largest species worldwide. As such, it can be readily identified in that part of the British Isles where it occurs.
In the British Isles this species is known only from Guernsey and Sark in the Channel Islands, although it only colonised there quite recently; the first record being from Guernsey on 2nd July 1997 and on Sark in September 2006 (the late C David, pers. comm.).
The world range of this bee is Trans-Palaearctic, extending from Fennoscandia to Iberia, east to China (Ascher & Pickering, 2012). It is also known from North Africa (Morocco).