Paper summarizes six-year long (2007-2012) studies on dragonflies (Odonata) in the county of Pleszew (Western Poland) as well as the eight border sites located in the area of adjacent counties (Fig. 1). The whole area is in the macroregion of the Pohidniowowielkopolska Lowland, in the borderland of two mesoregions: the Kalisz High Plain and Rychwalska Plain. The research was aimed at understanding the species composition of dragonflies and discovering as many sites of rare species as possible. 58 sites lying on the Kalisz High Plain and 85 sites located in the Rychwalska Plain were controlled. Noteworthy is the presence of tens Sphagnum peat bogs in the studied part of the Rychwalska Plain. Dragonflies were caught with an entomoloACgical net and were released after being photographed, exuviae were also collected as well as larvae at one site. Most of the sites were controlled irregularly (mainly between June and August), often only once. The records of particular species were differentiated into three categories: 1) development confirmed (larvae, exuviae, teneral imagines, intensive reproductive behavior - copulations, tandems, laying eggs), 2) development likely (single reproductive behavior, territorial imagines, a large population in the environment suitable for development), 3) development possible (single imagines observed only). In the years 2007-2012 in the discussed area 55 species of dragonflies were recorded (data in this paper), as well as Aeshna júncea given earlier (Bernard, Toñczyk 2011). Total number of 56 species comprise 77% of the species reported in Poland so far (Bernard et al. 2009). For many species important information clearly enriching the knowledge of their distribution in this part of Poland was collected. This particularly refers to the species associated with Sphagnum bogs (Aeshna subarctica, Leucorrhinia albifrons, L. dubia and L. rubicunda), thermophilous species (Aeshna affinis, Orthetrum albistylum, O. brunneum, O. coerulescens, Crocothemis erythraea, Sympetrum fonscolombii and S. meridionale) as well as rare and very rare in south-western Poland (Lestes barbarus, Sympecma paedisca, Coenagrion lunulatum, Epitheca bimaculata and Leucorrhinia caudalis). Protection of the studied Sphagnum peat bogs, where many rare and protected species of vascular plants (Zurawlew, Zurawlew 2010) and the dragonflies (this study) are present, should be one of the priorities of the Forestry Grodziec managing this area. The four tables given in this paper show: studied habitats with the number of species (Tab. 1), a list of the sites of all species and the observed flight period (Tab. 2), the sites with the highest number of species (Tab. 3) and the listing of the occurrence of dragonflies for 15 UTM squares covering the studied area (Tab. 4).
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