Rhophites halictulus Nylander, 1852, Dufourea (Dufourea) halictula amethystina Ebmer, 2008
Dufourea is a genus closely related to Rophites, the two sometimes distinguishable only with difficulty. The taxonomy of the two British species of Dufourea was very confused, the present species being referred to as D. minuta in some older literature.
Only known from Surrey (Woking and Byfleet) and Dorset (Ferndown and Parley). However not found since 1920 in the former county and 1953 in the latter.
This bee is locally distributed in continental Europe from southern Sweden east to the Ukraine and Russia and south to the Iberian peninsula.