Eugoa formosicola Bayarsaikhan & Bucsek & Bae 2018, n

Eugoa formosicola Matsumura, 1927 n. stat.

(Figs. 7, 26, 45)

Eugoa bipunctata formosicola Matsumura, 1927, J. Coll. Agric. Hokkaido Imp. Univ. 19(1): 62. TL: Taiwan, Horisha. Eugoa cesaneki Bucsek, 2008, Entomofauna 22(26): 429, figs. 22, 23, 81. TL: Peninsular Malaysia. n. syn.

Redescription (Figs. 7a, b). Wingspan 19–21 mm in male, 20–21 in female. Forewing ground color sordid white, mottled brown, with dark brown bands and two small, dark spots in discal and basal area; cilia pale yellowish, mixed with brown scales. Hindwing pale yellow, with gray-brownish terminal area or apical area; cilia white yellowish. Male genitalia (Fig. 26). Uncus stout, curved inwardly, with small spine apically. Valvae tapering, with a large protuberance apically, which densely covered with setae; a large spine-shaped process at medial of costal margin. Aedeagus stout, tapering, weakly sclerotized apically, and with one irregular, bent cornutus and an elongate, weakly sclerotized plate. Female genitalia (Fig. 45). Lamella antevaginalis rectangularly angled, sclerotized; lamella postvaginalis weakly sclerotized. Ductus bursae stout, weakly sclerotized, half the length of corpus bursae. Corpus bursae ovoid, heavily covered with thin spines.

Material examined. Cambodia. 1 ♂, Cardamom (N11˚58′47″, E103˚22′22″), 29.VI.2011 (YS Bae, YD Ju, U Bayarsaikhan and HJ Lee), Gen. Slide No. INU-1343; 2 ♂, 2 ♀, Seima (N12˚14′12″, E107˚02′35″), 9–11.XI.2011 (YS Bae, YK Kim, YD Ju, BS Park and HJ Lee), Gen. Slide No. INU-1536, 1538, 1623, 1624; 2 ♂, Seima (N12˚16′44″, E107˚03′56″), 12.XI.2011 (YS Bae, YK Kim, YD Ju, BS Park and HJ Lee), Gen. Slide No. INU- 1537, 1541; 1 ♂, Koh Kong (N11˚35′04″, E103˚13′20″), 22.II.2012 (YS Bae, YD Ju and BS Park), Gen. Slide No. INU-1540; 1 ♂, Kep (N10˚29′09″, E104˚17′44″), 16.VII.2012 (YS Bae, YD Ju, XV Le, BS Park and HJ Lee), Gen. Slide No. INU-1535; 1 ♂, Kirirom (N11˚19′14.77″, E104˚02′11.67″), 6.II.2014 (YS Bae, KS Oh, YD Ju, MJ Qi, BS Park, SM Na, JW Kim and DJ Lee), Gen. Slide No. INU-1539; 6 ♂, Koh Kong (N11˚41′44.9″, E103˚06′51.8″, Alt. 278m), 24–25.XII.2014 (YS Bae, YD Ju, MJ Qi, U Bayarsaikhan, BS Park, SM Na, JW Kim and DJ Lee), Gen. Slide No. INU-1613, 1614, 1615, 1616, 1618, 1676.

Distribution. Cambodia (Cardamom, Kep, Kirirom, Koh Kong, Seima), Peninsular Malaysia, Thailand, Taiwan, Japan (Okinawa).

Remarks. This species has been described from Taiwan by Matsumura (1927) as subspecies Eugoa bipunctata formosicola. Later it was treated as a synonym of Eugoa basipuncta (Hampson, 1891) with question mark by Holloway (2001) and synonym of Eugoa cesaneki Bucsek, 2008 by Bucsek (2016a). After diagnostic comparison with Eugoa bipunctata (Walker, 1862) from Malaysia (Figs. 62a, b, 65a, b), Eugoa basipuncta (Hampson, 1891) from India (see, Kirti & Singh 2016: 131), Eugoa bipunctata formosicola Matsumura, 1927 from Taiwan (Figs. 59, 63a, b), and Eugoa cesaneki Bucsek, 2008 from Malaysia (Fig. 60), Cambodia (Figs. 7, 26, 45) and Japan (Figs. 61a, b, 64a, b), established with a valid species, Eugoa formosicola (Matsumura, 1927) n. st., and Eugoa cesaneki Bucsek, 2008 is n. syn. of formosicola by authors of the present study. Eugoa formosicola (Matsumura, 1927) was reported from Cambodia by Bae et al. (2016) as Eugoa cesaneki Bucsek, 2008.