Data on sub-fossil insects from Holocene sites of the Urals, Pre-Urals region, and the central and northern parts of western Siberia are generalized. This work contains palaeontological material from 39 localities, most of them of alluvial genesis; the insect remains from peat bogs and zoogenic deposits have also been considered. Insect communities from alluvial sites correspond to modern entomofaunas from the same territories. The dynamics of insect faunas, which might have been associated with changes in landscape and climatic conditions, can be observed only at the borders of modern natural zones, such as tundra and taiga. The range limits of some boreal species seem to have moved northwards during the climatic optimum of the Holocene. No changes in insect faunas from the sites of alluvial and swamp genesis situated within the taiga zone have been observed, those insect assemblages being identical to the faunas of the areas containing these sits. Any changes in insect faunas in particular sections can be attributed to processes of ecological successions and the dynamics of local habitats. Based on spore-and-pollen data, no changes in plant communities caused by climatic fluctuations during the Holocene are expressed in the composition of insect complexes. This is demonstrated by taking two localities as examples: "Lake Pereval'noe" site from the polar Urals and Nyulsaveyto site from southern Yamal. The data presented in this paper generally correspond to those obtained over the territories of Western and Eastern Europe, as well as northeastern Siberia. However, at the same localities of zoogenic origin (pellets of birds, caves) we find some beetle species whose changes in distribution may have been linked to climatic fluctuations in the Holocene.
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