Harpendyreus tsomo, the Tsomo blue, is a butterfly of the family Lycaenidae. It is mainly found in Lesotho, but also in South Africa where it is known from high altitudes in the Orange Free State and the East Cape.
The wingspan is 17âÂÂ22 mm for males and 18âÂÂ23 mm for females. Adults are on wing from October to March, with a peak from November to December.
The larvae feed on young leaves, flowers and seeds of Mentha species.