With more than 1700 species, this "Bee" is so beautiful. And, looks awesome in this gallery on yellow flowers. This is the sweat bee genus Lasioglossum.
They are highly variable in size, coloration, and sculpture; among the more unusual variants, some are cleptoparasites, some are nocturnal, and some are oligolectic.
See more information on Wikipedia.
"Sweat Bee Genus Lasioglossum" Gallery
- Sweat Bee From Busy in Collecting Honey More