Polynova Olga E. RussiaMoscowPeoples' Friendship University of Russia named after Patrice Lumumba, 6 Miklukho-Maklaya St., Moscow 117198, Russiaolgapolynova@yandex.ru Author's articles Foster’s or island rule in populations of Phrynocephalus mystaceus and Eremias velox (Reptilia, Lacertilia) on the sandy massif Sarykum Size and age changes in color in the Rapid racerunner, Eremias velox (Pallas, 1771) (Reptilia, Lacertilia) population on the Sarycum sandy massif