Voorpost van het zuiden: De libellen van de Nederlandse St. Pietersberg

33 species recorded from the Dutch St. Pietersberg (Limburg) are listed. Suitable breeding habitats are present in the Encigroeve, a marlquarry which is still in production. Two distinct habitat types can be distinguished here; seepage areas with shallow ponds and small streams and clear well-vegetated lakes. The fauna has remarkable southern affinities with reproduction of Sympecma fusca, Cercion lindenii and Crocothemis erythraea in the lakes and Ischnura pumilio, Orthetrum brunneum, Orthetrum coerulescens and Sympetrum fonscolombii in the seepages. Sympetrum striolatum is particularly abundant. The exploitation of the quarry and its physical features provide the continuing presence of pioneer habitats for the seepage species whilst most of the lakes will be conserved.