A detailed redescription is given of the poorly known female of the chrysomelid beetle Cryptocephalus (Protophysus) wehnckei Weise, 1882, which is endemic to Turkey. Based on a large number of samples collected from Isparta province, we noticed some conspicuous colour variation between and within the males and females of this species, and we illustrate this colour variation. Photographs of the habitus and genital structures are also presented. Some biological features of the species (e.g. mating behaviours, phenology, habitat and host plant information) are described here for the first time.