Blue Banded Bee collecting nectar from salvia flowers

The Blue Banded Bee must be one of the most beautiful of Australia’s native bees. They are rumored to be attracted to blue and purple flowers. They were certainly enjoying the purple salvia (sage family) on the weekend! The bees in this video are all female. Can anyone tell me how to identify the females? [club96170081|ИНТЕРЕСНЫЕ ФАКТЫ О ПЧЕЛАХ]