Parasitised Cyclosa conica (Araneae: Araneidae) were found in three spruce forests in southern Ostrobothnia on the west coast of Finland. The spiders were reared and ichneumonids of the solitary koinobiont ectoparasitoid Polysphincta nielseni emerged. These are the first records of the wasp species in Finland. Cyclosa conica (Araneae) : Host Polysphincta nielseni (Ichneumonidae) : Parasite New record Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Land zones; Palaearctic region; Eurasia; Europe Cyclosa conica; Hymenopteran parasites; New host record; parasite biology & distribution notes; Polysphincta nielseni; Finland; Narpes, Overmark Polysphincta nielseni; Arachnid hosts; New geographical record; biology & distribution notes; Cyclosa conica; Finland; Narpes, Overmark none