Coenagrion ornatum is a critically en- dangered species in Poland. It has been know from 24 localities so far, of which only one is preserved till now – in Śniatycze situated east of Zamość (south-eastern Poland). The authors give and discuss a new species lo- cality situated west-north-west of Zamość, ca. 40 km from Śniatycze, in the village of Średnie Duże (50°50’32”N, 23°01’15”E, UTM: FB43) (Fig. 1, Phot. 1–3). The species inhabits the River Rakówka. The discovery was made on 13 July, thus the estimating of population number is uncertain, however, it can be at least equally numerous as the po- pulation in Śniatycze which is regarded as large and stable. New data moves the boundary of the current range of C. ornatum in Poland a bit to the north. The presence of the species in south-eastern Poland is probably associa- ted with its occurrence in western Ukraine, where it was recorded at ca. 20 localities. Although many of them are historical ones, there is also fresh data from the Shatsk Lake District (CHROKALO, WERWES 2009). Rakówka seems to be untypical as a ha- bitat of C. ornatum due to high values of ri- ver section and >ow velocity. However, the calculated parameters of >ow turned out to be similar to these from the other localities of this species. The discussed locality is seriously en- dangered due to its localization in the centre of a village – the small river is fragmented into many stretches with different type of using. The Ornate Bluet has been observed on the stretch of the total length of ca 200 m, however, the numbers were different. In pla- ces with the least favourable conditions (with the bottom of concrete and removed vegeta- tion) the species was absent. Passive and acti- ve protection of this locality is a must.