Mostly solitary bees. Pollen-carrying structure (a scopa) is on the ventral surface of the abdomen. Almost all other bee families have it on the hind legs.
Megachilidae is a cosmopolitan family of mostly solitary bees. Characteristic traits of this family are the restriction of their pollen-carrying structure (called a scopa) to the ventral surface of the abdomen (rather than mostly or exclusively on the hind legs as in other bee families), and their typically elongated labrum.
