1) Arthropod family 2) Family megachilidae 3) Leaf-cutting and mason bees 
The Megachilidae are a cosmopolitan family of (mostly) solitary bees whose pollen-carrying structure (called a scopa) is restricted to the ventral surface of the abdomen (rather than mostly or exclusively on the hind legs as in other bee families). Megachilid genera are most commonly known as mason bees and leafcutter bees, reflecting the material...
[n] - leaf-cutting and mason bees
family Megachilidae noun leaf-cutting and mason bees