* Lestodiplosis vasta (Möhn, 1955)

(Figure 27 C)

Material: VE, Larvik: Rakke, 58.98361°N 10.01825°E ± 20m, 8 June 2021, L, leg. AF, coll. Private.

Biology and notes: This unique species is a predator of the millipede Polyxenus lagurus (Linnaeus, 1758) (Myriapoda) . One to three red, glabrous midge larvae attach themselves to the millipede and suck nutrients from it (Möhn, 1955c). According to Skuhravá & Skuhravý (2021), the attacked millipede dies shortly after the attack. Multivoltine; pupation takes place directly on the prey according to Möhn (1955c). The species has been observed several places in Vestfold, infesting P. lagurus living under the bark on Quercus robur . We have attempted to hatch the adults, but so far without success.

Distribution: Known only from Germany and Norway.