Wing square variability of Pieris napi L. (Lepidoptera: Pieridae) in latitude gradient of Urals

Variability of the imago sizes of polivoltine type of white butterflies Pieris napi L. in latitude gradient of Urals, taking into account the quantity of generation during the season is analysed. For different generation of imago the different directions of geographical variability of wing square are characteristic. Significant distinctions by the sizes between imago of the first generation from different latitudes it isn't revealed. Regression dependence of the wing square of imago of the second generation has the parabola appearance which top corresponds to geographic latitudes where at P.napi transition from bivoltine life cycle to polivoltine is observed.