Variation in four morphometric characters in M. athalia, M. aurelia and M. britomartis: forewing height (FWH), forewing lunule surface (FWLS), forewing lunule height (FWLH) and hindwing surface (HWS). Statistically significant differences between pairs of species (Bonferroni test) are shown with capital (p < 0.001) and small (0.001 < p < 0.05) letters. When only a trend in differences between species is shown (0.05 < p < 0.1), small letters with apostrophe are used.