In the year 2012 a small autochthonic population of Leucorrhinia albifrons (BURMEISTER, 1839) was discovered in the area of the former underground mine of sulphur „Je- ziórko” (south-eastern Poland, 50°33’34”N, 21°48’00”E, UTM EB50). It inhabited one of the arti;cial water bodies created in the frames of reclamation of this area, situated in the depression, gathering +owing or dis- charging waters from the surrounding areas (Phot. 1). In May and June a few individuals of L. albifrons was observed, with juvenile specimens of both sexes in it. A site of L. albifrons was characterized by abundant swamp vegetation (Phragmites australis mainly) and moderately abundant +oating and submerged vegetation (Potamogeton natans, Ceratophyllum demersum, Utricularia vulgaris). Water was transparent, moderately alkaline (pH: 7.71), quite strongly mineralized (electrolytic conductivity: 2325 μS·cm-1, dissolved solids:1163 mg·dm-1, sa- linity: 1.2 PSU). Compact range of L. albifrons in Poland is limited to lakelands in the north of the coun- try. Farther towards the south there is a zone of the insular occurrence, on single sites or their groups. This zone reaches south-eastern Poland through which the range boundary is running – from Slovakia only one single sites is known, historical and doubtful one. The site in „Jeziórko” is situated near the southern range boundary of L. albifrons which is marked nowadays by three sites in the Przemyśl Foothills. Its discovery is a val- uable supplement to the knowledge about the distribution of the species on the edge of its range. This shows that this species can occur at more sites and in more regions than pre- viously thought. The new site con;rms also the previous data that the occurrence of the species in the marginal zone of the range is in large part connected with secondary habitats which can locally contribute to the increase in species distribution in comparison to his- torical period.
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