The three VT species of shiny green bees can readily be identified by small features that are hard to see in most photos. In photos when these features aren't visible, identification can be challenging and subjective. The three species fall along a gradient from large and bright green to small and golden-green, with some overlap.
See also Striped Sweat Bees (Agapostemon
The features below are definitive, if visible.
Unless otherwise specified, photos are courtesy of Margarita Miklasevskaja at PCYU with funding from NSERC-CANPOLIN.