Agriades optilete, the cranberry blue, is a butterfly of the family Lycaenidae. It is found in north eastern Europe, the Alps, North Asia, Japan, Korea and north western North America.
The length of the forewings is about 14 mm. The chalkhill blue (Lysandra coridon) is a butterfly in the family Lycaenidae. It is a small butterfly that can be found throughout the Palearctic realm, where it occurs primarily in grasslands rich in chalk. Males have a pale blue colour, while females are brown. Both have chequered fringes around their wings.
Lysandra coridon has a wingspan of 30–36 millimetres (1.2–1.4 in). These small butterflies present a sexual dimorphism. The males having pale silvery-blue upperside of the wings with a submarginal line of grey spots on the hindwings and a thin brown and white chequered fringe. Females have dark brown upperside of wings, with marginal orange spots and also with chequered fringes. The underside of the wings show a light ochre colouration, several dark spots surrounded by white, a submarginal line of black marks, a series of marginal orange spots on the hindwings and a blue dusting near the body.
As with many blue butterflies, separation from similar species in the field is on the underside markings. Aberrations are common.
