Abstract: Anton V. Gavriluyk & Tatiana A. Novgorodova Dr. Anton V. Gavriluyk (contact author), Dr. Tatiana A. Novgorodova, Institute of Animal Systematics and Ecology, Siberian Branch, Russian Academy of Sciences, Frunze ul., 11, Novosibirsk, 630091, Russia. E-mail: aphids@mail.ru (AVG); tanovg@yandex.ru (TAN) Myrmecol. News 10: 106 A comparative analysis was made of the efficiency of protection of aphids (Homoptera: Aphididae) from aphidophagous species by different species of ants (Hymenoptera: Formicidae). The investigations were carried out in the Novosibirsk region in 2006. Colonies of myrmecophile aphids (521) were explored alongside 44 km of a road and at model sites located in different plant associations. The degree of protection of aphids from aphidophagous species by 12 ant species with different territorial organizations was investigated. Based on types of territorial organization, data on ant species were subsumed under genera / subgenera: Formica s.str. (F. rufa Linnaeus, 1761, F. lugubris Zetterstedt, 1838, F. polyctena FÖRSTER, 1850, F.…