Polynova Galina V. RussiaMoscowPeoples' Friendship University of Russia named after Patrice Lumumba, 6 Miklukho-Maklaya St., Moscow 117198, Russiagalinapolynova@mail.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 Sexual structure peculiarities in lizard populations of the family Lacertidae, genus Eremias and the family Agamidae, genus Phrynocephalus during their breeding season Population density dynamics of the Phrynocephalus mystaceus mystaceus (Reptilia, Agamidae) intrapopulation group on the Sarykum sandy massif during the breeding season