Dactylispa subquadrata (Baly, 1874)

Fig. 17 A – D

Host plant.

Fagaceae: Castanea crenata Sieb. et Zucc., Castanopsis sieboldii (Makino), Quercus dentata Thunb., Q. aliena Blume, Q. serrata Thunb., Q. variabilis Blume, Q. glauca (Thunb.) .

Leaf mine.

Full-depth linear-blotch mine on mature leaf (Fig. 17 B – D). The mine has many holes perforated by larva on each side of the mine, and frass is excreted outside through the holes. The fully grown larva pupates in the mine. The upper layer tissue around the pupation site is often kept intact, so that the pupa is hidden by the green tissue and kept less conspicuous.

Material examined.

• 11 adults, Yashiro, Katô, Hyôgo Pref., 25-VI-2019 (as larva on Quercus serrata), emerged on 19–23-VII-2019 (Fig. 17 A – C) ; Several leaf mines, Toyohara, Nasu, Tochigi Pref., 2-VII-2022 on Quercus dentata (Fig. 17 D) ; • 1 adult, Hami, Miyazu, Kyoto Pref., 3-VIII-2008 (as larva on Quercus variabilis), emerged on 4-VIII-2008 ; • 1 adult, Hami, Miyazu, Kyoto Pref., 16-VII-2012 (as larva on Q. glauca), emerged on 1-VIII-2012 ; • 1 adult, Kushimoto-ôshima, Higashimuro-gun, Wakayama Pref., 2-VIII-1999 (as larva on Castanopsis sieboldii), emerged on 3-VIII-1999 ; • 1 adult, Hami, Miyazu, Kyoto Pref., 3-VIII-2008 (as larva on Castanea crenata), emerged on 5-VIII-2008 .