Colour Wheel Bee

The garden is full of these iridescent, green, "sweat", solitary, ground-living bees. These descriptors cover numerous species, and so I'm hedging my bets that this is one of them. The purple Echinacea, revitalized by the weekend's rains, seemed to provide some pollen/nectar, plus the perfect background, colour-wise.

Edit - Since I just decided to become a full-blown-member, it might be best to view this in its large form...