Ozirhincus millefolii (Wachtl, 1884)

(Figure 55 C–D)

Material: TEI, Notodden: Nystul, 59.55068°N 9.13674°E ± 50m, 21 August 2019, L, leg. AF, coll. Private ; VE, Larvik: Oddanesand, 58.96947°N 9.85008°E ± 20m, 18 August 2019, L, leg. AF, coll. Private ; Faerder: Tjøme, Grepan, 59.06377°N 10.41484°E ± 20m, 23 August 2019, L, leg. AF, coll. Private ; Ø, Hvaler: Skipstadkilen, 59.04770°N 10.94045°E ± 20m, 2 September 2919, L, leg. AF, coll. Private ; AK, Frogn: Kaholmene, 59.675784°N 10.605837°E ± 360m, 11 July 2019, MF, leg. HE, BOLD: NHMO- ENT-548178, coll. NHMO; Oslo: Gressholmen, 59.884464°N 10.721112°E ± 200m, 3 May 2019, MF, leg. HE, coll. NHMO; SFI, Aurland: Flåm, 60.857940°N 7.110750°E ± 1000m, 22-23 June 2019, 3L, leg. ZF & AK, coll. NHMO .

Biology: The yellow larvae develop singly in achenes of Achillea spp. Our records are from A. millefolium ( Asteraceae). The infected achenes are strongly swollen, but the capitulum as a whole shows no outward sign of damage. Bi- or multivoltine. Pupation and hibernation in the gall.

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