Heterarthrus vikbergi sp. nov. 64 young Populus balsamifera at type locality, with numerous leaf-mines (sawfly mines mixed with mines of Isochnus sequensi (Stierlin, 1894): Coleoptera, Curculionidae) 65 pressed P. balsamifera leaves containing mines 66 mature larva preserved during moult, ventral 67 mature larva posterior ventral 68 mature larva anterior dorsal. Scale bar: 1mm.

  Part of: Liston A, Mutanen M, Viitasaari M (2019) On the taxonomy of Heterarthrus (Hymenoptera, Tenthredinidae), with a review of the West Palaearctic species. Journal of Hymenoptera Research 72: 83-126. https://doi.org/10.3897/jhr.72.39339