The species belonging to this genus are easily distinguished from most of the other Tachinidae by their metallic colour -green, blue or purple, although grey coloured species are known. From the nineteen species cited in the literature, seven are herein redescribed: Chrysotachina braueri Townsend, 1931; Chrysotachina equatorialis (Townsend, 1912); Chrysotachina panamensis Curran, 1939; Chrysotachina peruviana Townsend, 1919; Chrysotachina purpurea Curran, 1939; Chrysotachina townsendi Curran, 1939; Chrysotachina willistoni Curran, 1939. The type material of C. peruviana and C. equatorialis was examined. Illustrations of the male terminalia and of the larvae of C. peruviana are presented. A key for the identification of twelve species from South America is also presented.