Unknown Fly

Unknown Fly

Observation - Unknown Fly. Description: A small brown Fly with what appears to be an egg on the under side. I know they both parasetise Bumble Bees but do they inject an egg or stick it to the fury body of the Bumble bee?

A small brown Fly with what appears to be an egg on the under side. I know they both parasetise Bumble Bees but do they inject an egg or stick it to the fury body of the Bumble bee?