I can confirm only that it's a leafcutter bee (fr: mégachile), genus Megachile. Unfortunately, I'm not able to pinpoint the exact species any more precisely, as I'm not a specialist in the leafcutter bees. Nevertheless, I can provide a photograph of a nest cell, and of the leafcutter bee. Enjoy!
|Occupied Megachile nest cell, with distinctive cut leaves|
|Megachile - leafcutter bee on mustard flower|
It's a beautiful day to be out in the garden.