Biological data are given for 12 parasitic wasps reared from bark beetles of some localities in Saxon Ore Mountains Erzgebirge (Germany) and Hartz Mountains (Harz): Rhopalicus clavicornis (WESM.), Coeloides bostrichorum GIR., Dendrosoter middenorfi RATZ., Roptrocerus xylophagorum (RATZ.), Roptrocerus mirus (WALK.), Roptrocerus tutela (WALK.), Rhopalicus quadratus (RATZ.), Dinotiscus eupterus WALK., Metacolus unifasciatus FORSTER, Calosota vernalis CURTIS, Eurytoma arctica THOMSON, Ipideurytoma spessivtsevi BOUCEK & NOVICKY. The paper deals with: phenology, number of the generations, development of the larvae, duration of the development, hibernation, sex ratio, host and change of the host. The mating behaviour of Roptrocerus xylophagorum and Rhopalicus tutela is described in detail. none