Figs 12, 25, 34.
Dichomeris matsumurai Ponomarenko & Ueda, 2004: 151. TL: Thailand.
Material examined. CAMBODIA: 3♂, Kep (10°29'N, 104°18'E), 17.vii.2012, leg. Y. S. Bae et al., genitalia slide No. CIS-6685; 3♂, 1♀, same locality (10°30'N, 104°18'E), 11.xi.2015, leg. Y. S. Bae et al., CIS-6697; 1♀, Pursat (Osami), 2.v.2010, leg. Bae, Chae & Vi (INU).
Diagnosis. Adult (Fig. 12) wingspan 20.0–21.5 mm. This species is similar to D. bulawskii Ponomarenko & Park, 1996 superficially. It is easily differentiated from D. bulawskii by the vinculum without lateral lobes and the aedeagus with two sclerotized lobes from the zone in the male genitalia (Fig. 25), and the eighth tergite straight on the posterior margin in the female genitalia (Fig. 34). In D. bulawskii, the vinculum has two asymmetrical lateral lobes, the aedeagus bears four sclerotized lobes from the zone, and the female eighth tergite has sclerotized quadrate plate on the posterior margin (Ponomarenko & Park 1996: 114, Figs 1, 5–8).
Distribution. Cambodia (Kep), Thailand.