"This one is maybe a viridescent green metallic bee. There was an article about them in the May/June issue of Horticulture magazine." says Amy.

The Virescent Green Metallic Bee, Agapostemon virescens is a ground nesting bee that feeds on nectar of flowers. In the process, of course, it helps spread pollen around.

Thanks to Justine for the identification.
Mr PGC