Thestor vansoni, the Van Son's skolly, is a butterfly of the family Lycaenidae. It is found in South Africa, where it is found in the Nama Karoo just below the peaks of the Gydoberg, the Skurweberg and the Cederberg in the Western Cape. The wingspan is 24–29 mm for males and 27–34 mm for females. Adults are on wing from the September to November, with a peak in October. There is one generation per year. References Butterflies described in 1962 Thestor Endemic butterflies of South Africa