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 dark brown. Both have chequered fringes around their wings. Mt Terminillo< Rieti, Lazio, Italy August 2020