* Rhopalomyia foliorum (Löw, 1850)

(Figure 49)

Material: VE, Larvik: Rakke, 58.98399°N 10.01903°E ± 20m, 10 September 2021, L, leg. AF, coll. Private; AK, Oslo: Ellingsrud, 59.930984°N 10.921089°E ± 10m, 27 June 2022, PMF, leg. HE, coll. NHMO .

Biology: The dirty yellow larvae develop singly in bud-like galls on the stems and leaves of Artemisia spp. ( Asteraceae). Our records are from Artemisia vulgaris . The galls are only about two millimeter long and brown to yellowish or purplish. Multivoltine. The early generations pupate in the gall. The larvae of the last generation leave the gall to hibernate in the soil.

Distribution: Widespread in Europe including Norway, Sweden and Denmark. Japan.