Family Megachilidae (Leaf-cutter Bees, Mason Bees, and allies)
Subfamily Megachilinae
Tribe Megachilini
Genus Megachile (Leaf-cutter and Resin Bees)
No Taxon (Subgenus Megachile)
Species centuncularis (Megachile centuncularis)

As shown in this photo, female leaf-cutter bees (other than parasitic species) collect pollen on the undersides of their abdomens.