Many old records and ecological notes attributed to this species have to be treated with caution due to confusion between this species and the very similar A. pubescens Curtis.
This species is not covered by Lomholdt (1984), since it is not a Fenno-Scandinavian species.
The January 2019 PoMs Newsletter is available here
An all black species, the abdomen, particularly in the female, with paired spots of silvery-grey pubescence. The posterolateral projections on the propodeum distinguish it immediately from most other British species.
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.
Corrections to the Handbook of the Bees of the British Isles have been issued by Mike Edwards. The corrections can be downloaded HERE
Corrections to the Handbook of the Bees of the British Isles. Issued January 2019