Pieris napi

This is a circumboreal species.

The females have 2 spots on forewing, the males have only one.

The rear underwings are pale yellow with black scales over the veins giving a green appearance.

The males release a pheromone - citral , which is also the main flavour in lemon peel oil

Pieris rapae

The female has 2 black dots on forewing, the male has one