* Semudobia tarda Roskam, 1977

(Figure 57 C–E)

Material: AK, Oslo: Ellingsrud, Munkebekken, 59.931515°N 10.913550°E ± 20m, 23 February 2021, Betula pendula, MF, leg. HE, coll. NHMO .

Biology: The orange larvae develop individually in seeds of Betula pendula and B. pubescens ( Betulaceae).Infectedseedsareswollen,somewhat glabrous, have strongly reduced or missing wings, and have a small, round, thin-walled “window” on one side, from which the midge will emerge. Univoltine. The larva hibernates in the gall and pupates there in the spring.

Distribution: Widespread Palearctic, including Norway and Denmark. Introduced to the Nearctic.