Green vegetable bug

The adult males can reach a body length (from front to elytral apex) of about 12.1 millimetres (0.48 in), while females are bigger, reaching a size of about 13.1 millimetres (0.52 in). The body is bright green and shield-shaped and the eyes are usually reddish, but they may also be black. They differ from the similar green stink bug (Acrosternum hilare) by the shape of their scent gland openings, which are short and wide in N. viridula, and narrow and long in the green stink bug.