Sinichkina О. V. RussiaSaratov State Medical University, 112, Bolshaya Kazachya Str., Saratov, 410010, RussiaOlga_Sinichkina@mail.ru Author's articles The Edge Effect of Casebearer Species (Lepidoptera, Coleophoridae) in the Forest-steppe Ecotones of Lower Volga Region