Dactylispa masonii Gestro 1923

Dactylispa masonii Gestro, 1923 Fig. 17 E – N Host plant. Asteraceae: Ainsliaea acerifolia Sch. Bip., Aster yomena (Kitam.), Cacalia auriculata DC. var. kamtschatica (Kitam.), Cirsium ashiuense S. Yokoy. et T. Shimizu, C. confertissimum Nakai, C. inundatum Makino, C. kiotoense, C. longepedunculatum Kitam., C. microspicatum Nakai, C. okamotoi Kitam., C. olygophyllum (Franch. et Sav.), C. sieboldii Miq., C. suzukaense Kitam., C. tashiroi Kitam. var. hidaense (Kitam.), C. tonense Nakai, Ligularia fischeri (Ledeb.), L. hodgsonii Hook., Parasenecio hastatus (L.) ssp. orientalis (Kitam.), P. farfarifolius (Siebold et Zucc.) var. bulbiferus (Maxim.), Petasites japonicus, Syneilesis palmata (Thunb.). Leaf mine. Dark upper-layer aggregate blotch mine on mature leaf (Fig. 17 G – I, L – N). Frass is granular, deposited along meandering larval trajectory. Often several larvae aggregately mine in a leaf, and the mined area is large and turns blackish. The fully grown larvae pupate together in the mine. Material examined. • 20 adults, Kawazu, Kamo-gun, Shizuoka Pref., 7-VI-2015 (as larva on Syneilesis palmata), emerged on 15–20-VI-2015 (Fig. 17 E – H); • 2 adults, Aikappu, Akkeshi, Hokkaidô, 4-VIII-2023 (as larva on Parasenecio hastatus ssp. orientalis), emerged on 19-VIII-2023 (Fig. 17 I); • 4 adults, Hotokegaura, Sai-mura, Shimokita, Aomori Pref., 27-VII-2009 (as larva on Parasenecio farfarifolius var. bulbiferus), emerged on 24–28-VIII-2009; 1 adult, Renge-onsen, Itoigawa, Niigata Pref., 4-IX-1999 (as larva on Ainsliaea acerifolia), emerged on 15-IX-1999; • 2 adults, Suehiro, Akkeshi, Hokkaidô, 4-VIII-2023 (as larva on Ligularia hodgsonii), emerged on 19-VIII-2023 (Fig. 17 N); • 5 adults, Hiruzen, Maniwa, Okayama Pref., 30-VII-2018 (as larva on Ligularia fischeri), emerged on 2–30-VII-2018; • 1 adult, Ashiu, Nantan, Kyoto Pref., 7-VIII-1991 (as larva on Cirsium ashiuense), emerged on 20-VIII-1991; 8 adults, Daigonji-kôgen, Matsunoyama, Tôkamachi, Niigata Pref., 19-VIII-2008 (as larva on Cirsium inundatum), emerged on 21–29-VIII-2008; • 5 adults, Aburazaka, Ôno, Fukui Pref., 6-IX-2019 (as larva on Cirsium tashiroi var. hidaense), emerged on 4–7-X-2019; • 5 adults, Koigakubo, Tessai, Niimi, Okayama Pref., 9-X-2017 (as larva on Cirsium tashiroi var. hidaense), emerged on 17-X-2017; • 5 adults, Niken-chaya, Shizuichi, Sakyô, Kyoto Pref., 10-VI-2015 (as larva on Cirsium kiotoense), emerged on 30-VI-2015; 1 adult, Mt. Hakusan, Shiramine, Hakusan, Ishikawa Pref., 27-VII-1998 (as larva on Cirsium matsumurae), emerged on 20-VIII-1998; • 1 adult, Kaida-kôgen, Kiso, Nagano Pref., 7-VIII-2016 (as larva on Cirsium oligophyllum), emerged on 30-VIII-2016; • 1 adult, Toyohara, Nasu, Tochigi Pref., 30-VII-2018 (as larva on Cirsium makinoi), emerged on 3–20-VIII-2018; • 2 adults, Doai, Minakami, Tone-gun, Gunma Pref., 30-VII-2018 (as larva on Cirsium microspicatum), emerged on 3–20-VIII-2018; • 16 adults, Bibi, Chitose, Hokkaidô, 30-VI-2023 (as larva on Petasites japonicus), emerged on 24–26-VII-2023; 20 adults, Beppo, Nemuro, Hokkaidô, 23-VII-2018 (as larva on Petasites japonicus), emerged on 2–27-VIII-2018; • 6 adults, Kisofukushima, Kio Nagano Pref., 19-VII-1999 (as larva on Petasites japonicus), emerged on 2–11-VIII-1999;