Halticorcus kasuga (Nakane, 1963)

Fig. 8 A – H

Host plant.

Polypodiaceae: Lepisorus miyoshianus (Makino) ., L. onoei (Franch. et Sav.), L. thunbergianus (Kaulf.), Pyrrosia linearifotia (Hook.) and Lemmaphyllum microphyllum C. Presl. are reported as adult’s host plants by Suzuki et al. (2008).

Leaf mine.

Upper-layer linear-blotch mine on mature leaf (Fig. 8 B, F, G). The fully grown larva (Fig. 8 H) exits the mined leaf, falls to the ground, and pupates underground.

Material examined.

• 3 adults, Mt. Shizuhata, Aoi-ku, Shizuoka Pref., 27-VII-2017 (as larva on Lepisorus thunbergianus), emerged on 12–18-IX-2017 (Fig. 8 A, B) ; • 1 adult on L. onoei, Shôji-ko Lake, Fuji-kawaguchi-ko, Yamanashi Pref., 8-IX-2019 (Fig. 7 C) ; • 2 adults, Shimo-shimizu, Kiso-fukushima, Nagano Pref., 7-VIII-2011 (as larva on L. miyoshianus), emerged on 4-IX-2011 (Fig. 7 D – H) .