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The result of study of distribution of rove beetles (Coleoptera, Staphylinidae) in the main types of biotopes of the Lower Volga region during many years in the paper is given. Correlation between ecological features of the region, biotopical distribution and species composition of rove beetles is considered.

Key to the subfamilies of chironomids (Chironominae) based on the morphology of the male genitalia includes 16 genus and 45 species found in the Volga river floodplain lakes (Saratov region). For the six species of the four genera of the tribe Chironomini (Einfeldia sp.1, Chironomus sp. (Lobochironomus), Dicrotendipes sp.1, Dicrotendipes sp.2, Parachironomus sp., Polypedilum sp.) described morphological differences from the known and the most directly comparable species. 

The article contains information about the reliable finding of black widow (Latrod ectus tredecimguttatus) on the territory of Saratov Province.

During four field seasons (2013–2016.) conducted a study of the structure of morphological variability and vitality. 38 populations of Tulipa gesneriana in several areas of the Lower Volga region and adjacent territories. The significant variability in the vitality structure of the populations as on the interpopulation level, and year. It is revealed that years of observation in General, most populations of the species were quite pronounced tendency for a gradual reduction of vitality. from 2013 to 2015 and significantly improve the plants in them in 2016.

5 species of millipedes, 12 species of geophilomorph centipedes, 3 species of scolopendromorpha centipedes, 11 species of lithobiids and 1 species of scutigeromorph centipedes are listed for the territory of the Lower Volga region (in the limits of Saratov, Volgograd, Orenburg and Astrakhan regions and Kalmyk Republic) as a result of processing of collection materials kept in ZM MSU, ZIN RAS, collection of the Department of Biology and Chemistry of the UlSPU and of the Department of Animal Morphology and Ecology, Saratov State University, and exploring of literary sourc