* Lestodiplosis tarsonemi Rübsaamen, 1895

(Figure 27 A–B)

Material: AK, Asker: Saetrepollen, N of Grytnes, 59.678368°N 10.538581°E ± 50m, 31 October 2020, LI, leg. TS, coll. NHMO .

Biology and notes: The red, glabrous larvae are predators of the mite Steneotarsonemus phragmitidis (von Schlechtendal, 1898) (Acari: Tarsonemidae), which forms galls on Phragmites australis ( Poaceae). Probably univoltine. The larvae in our case hibernated in the mite gall and pupated there in the spring. Several species of Lestodiplosis are associated with gallers on Phragmites australis . We have identified this species based on a clear association with the host mite. The larvae were numerous inside the galls of the mite (Figure 27 A).

Distribution: Known only from Netherlands, Germany and Norway.