I’m always excited to see green bees, because they aren’t as common as a lot of other species, and they’re strikingly beautiful.
SDSU shared some great info about these bees:
They have a bright, metallic-green head and thorax with a striped black and white (female) or yellow (male) abdomen. They forage on a wide range of flowers, but are commonly found on coneflowers, asters and sunflowers, where pollen is collected on their hind legs. Bicolored striped-sweat bees do not have large colonies like the honeybee, but they do have small aggregations, where each female is responsible for her own young. Nests are constructed in the ground in sparsely vegetated areas, which can include bare spots in yards, as well as garden beds.
Sources
South Dakota State University: https://extension.sdstate.edu/beneficial-pollinators-honey-bees-and-bicolored-striped-sweat-bee