Romanova E. B. RussiaNizhny NovgorodNizhny Novgorod’s Lobachevsky State University, 23 Gagarina Av., Nizhny Novgorod 603950, Russiaromanova@bio.unn.ru Author's articles LEUKOCYTE BLOOD COMPOSITION FEATURES OF GRASS SNAKE (NATRIX NATRIX) AND DICE SNAKE (N. TESSELLATA) (REPTILIA: COLUBRIDAE) FEMALES IN THE SAMARA REGION