Megachile atriventris SCHENCK 1853
An identification key is available (Else, 1999). Females from the British mainland and the Isle of Man have black scopal hairs on the fifth and sixth sterna, those occurring in Ireland have the sternum with the entire scopa reddish-golden.
Megachile willughbiella is one of the most frequently observed and widely distributed leafcutter bees in the British Isles. It is found from the Isles of Scilly through Cornwall and Devon northwards, though sporadically, to Inverness, Scotland. Also recorded in Ireland and the Channel Islands. Records naturally are less frequent the more northerly one travels. Despite its wide geographical spread there are still gaps in its current distribution. Mid and north Wales and the north Midlands appear not to support this species though this is possibly a consequence of limited recording activity in these regions rather than a restriction in range. It should also be noted that these potentially under-recorded regions are high altitude which may have a bearing on this species’ abundance and distribution.
It occurs in western Europe from Spain to Lithuania and Finland.