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Two Nymphalidae species – Apatura ilia ([Denis & Schiffermüller], 1775) and Limenitis camilla (Linnaeus, 1764) are reported from the territory of West Siberia for the first time. At this moment we can observe the second wave of expansion of nemoral species of butterflies into Western Siberia from the European part of Russia. The driving factor of the range expansions discussed is no doubt the notorious global warming.

This article considers 12 species from the families of Geometridae, Notodontidae, Erebidae, Noctuidae reported from the territory of Omsk and Novosibirsk Regions of Russia. 5 species are new to Omsk Region, among them, Horisme aemulata (Hübner, 1813), Herminia grisealis ([Denis & Schiffermüller], 1775), Hydraecia osseola (Staudinger, 1882), Euxoa hastifera (Donzel, 1847), Agrotis robusta Eversmann, 1856. 7 species are new to Novosibirsk Region, among them, Limeria macraria Staudinger, 1892, Scopula tessellaria (Boisduval, 1840), Cerura przewalskyi (Alheraky, 1882), Pachetra sagittigera (Hufnagel, 1766), Hadena christophi (Möschler, 1862), Mythimna anderreggii (Boisduval, 1840), Agrotis robusta Eversmann, 1856. The presence of Phaiogramma etruscaria (Zeller, 1849) in Novosibirsk Region confirmed by new materials.

A total of 781 species of Microlepidoptera belonging to 41 families are reported for the territory of Omsk Region. The most numerous is the Tortricidae family represented by 255 species, then Crambidae (94 species), Gelechiidae (70), Pyralidae (66), Pterophoridae (44), Depressariidae (32), Gracillariidae (29), Tineidae (25), Elachistidae (14), Adelidae and Elachistidae (8 species in each family), Yponomeutidae, Ypsolophidae, Ethmiidae and Cosmopterigidae (7 species in each family), Scythrididae and Oecophoridae (6 species in each family), Eriocraniidae (4), Nepticulidae, Momphidae and Epermeniidae (3 species in each family), Prodoxidae, Glyphipterigidae, Lyonetiidae and Choreutidae (2 species in each family), Opostegidae, Incurvariidae, Roeslerstammiidae, Argyresthiidae, Plutelliidae, Acrolepiidae, Bedelliidae, Parametriotidae, Chimabachidae, Cryptolechiidae, Batrachedridae, Blastobasidae, Autostichidae, Galacticidae (1 species in each family). 10 species are new to the Omsk Region. Agonopterix purpurea (Haworth, 1811) and Aethes flagellana (Duponchel, 1836) are reported from the territory of Omsk Region as new to the Asian Part of Russia; Fomoria weaveri (Stainton, 1855) reported from the territory of West Siberia for the first time.

The list of 19 species of Pyraloid moths new to the fauna of Omsk Region is given. 13 of them are new to the West Siberia and 5 are recorded from the Asian part of Russia for the first time, namely, Insalebria serraticornella (Zeller, 1839), Pseudophycita deformella (Möschler, 1866), Epischnia prodromella (Hübner, 1799), Ratasa alienalis (Eversmann, 1844), Pyrausta rectefascialis Toll, 1936. The second record of Krombia bimedia (Filipjev, 1924) in Russia is given.

Nine species of Lepidoptera from the territory of Omsk and Novosibirsk Regions are reported. Four species are new to Omsk Region, among them, Panchrysia ornata (Bremer, 1864), Sympistis campicola Lederer, 1853, Pseudohadena argyllostigma (Varga & Ronkay, 1991), Orthosia cerasi (Fabricius, 1775). Six species are new to Novosibirsk region, among them Eupithecia carpophillata Staudinger, 1897, Idaea nitidata (Herrich-Schäffer, 1861), Sympistis campicola Lederer, 1853, Sidemia spilogramma (Rambur, 1871), Polia malchani (Draudt, 1934), Sideridis lampra Schawerda, 1913.

Four species of Crambidae are reported from the territory of Omsk Region of Russia. Titanio ledereri (Staudinger, 1870) is new to Asian part of Russia, Loxostege peltalis (Eversmann, 1842), Catoptria verellus (Zincken, 1817) and Ostrinia peregrinalis (Eversmann, 1852) are new to West Siberia.

Background. Of great importance for bumblebees is the availability of a food base in two significant periods of life: at the beginning of flight activity after leaving wintering and at the end of flight activity in the period before wintering. The purpose of the work was to analyze the interacting groups of the interspecific association of bumblebees of Omsk forest-steppe at the beginning of flight activity after leaving wintering. Materials and methods. Field determinants are used in the work; the taxonomy of bumblebee species is given by Williams P. Results. Taking into account the timing of summer of each species included in the interspecific association, we identified the period of the beginning of the flight activity of bumblebees – from the 1st decade of May to the 3rd decade of June. Depending on weather conditions during the period of leaving the winter, the timing of flight activity may shift. Conclusions. At the beginning of the flight activity of bumblebees of the interspecific association of the central forest-steppe of the Omsk region from the 1st decade of May to the 3rd decade of June, the main forage plants are 28 species from nine families. The interspecific association of the central forest-steppe of the Omsk region at the beginning of flight activity, after leaving wintering, consists of several interacting groups, which at certain periods are formed from a different number of bumblebees.

An annotated check-list of the longicorn beetles of Omsk Region is given. The list based on literature data and collecting materials of authors. 41 species are new to the fauna of Omsk Region.

The article presents 13 species of Noctuoidea superfamily from Omsk and Novosibirsk regions of Russia. 6 species are new to Omsk region, 8 species are new to Novosibirsk region. 4 species are new to the Russian part of the West Siberian Plain, among them, Schrankia balneorum (Alphéraky, 1880), Spodoptera exigua (Hübner, 1808), Leucochlaena fallax (Staudinger, 1870), Mythimna anderreggii (Boisduval, 1840).