Abstract
This article presents the results of work on the species composition and biology of ants in the Semipalatinsk region. The characteristics of the main species of ants are given. Currently, there are about 15,800 species of formicides worldwide, of which about 117 species are found in Kazakhstan. The study of ants of the Semipalatinsk region was carried out in the spring and summer of 2021-2022. The research was carried out in the pine forest of the Semipalatinsk region, in the village of Bobrovka, on the island of Beibitshilik, in the village of Ptichnik, in the village of Vostochny, on the land of the old Kurgan and in settlements on the right and left banks of the Irtysh River. According to the results of the study, 25 species belonging to 6 relatives of formicides were identified, among which representatives of the relatives Formica, Camponotus, Cataglyphis, Myrmica, Lasius are most often found. According to the quantitative relationships, the genus Formica is 44%, the genus Camponotus is 20%, the genus Cataglyphis is 4%, the genus Myrmica is 20%, the genus Lasius is 8%, and the genus Monomorium is 4%.