none Enter This work presents hitherto published data on Acmaeops septentrionis (Thoms.) (Coleoptera: Cerambycidae), based on the thorough review of the available literature, as well as original data collected in Poland during 1999-2010. All distributional data in natural range of species are given. The occurrence in seven polish zoogeographic units, from which the species has not been earlier noted, i.e.: Pomeranian Lake District, Mazurian Lake District, Podlasie Region, Lower Silesia, Upper Silesia, Cracow- Wielun Upland and Western Sudeten is supplemented as well. Laboratory breeding of the immature stages of A. septentrionis have been also conducted for many years. This allowed to complement the knowledge on species ecology and behaviour. New parasitoid of A. septentrionis: Rhimphoctona melanura (Holm.) (Ichneumonidae: Campopleginae) was found. To ease the identification, a key to all European Acmaeops species is given. Acmaeops - LeConte in Agassiz 1850 (Cerambycidae): [Key to species, Europe, P. 51]. Acmaeops septentrionis (Cerambycidae): [Host; New record]. Rhimphoctona melanura (Ichneumonidae): [Parasite; New record].