(Figs 2M–O; 3M–O)

Holotype: ♂, Cambodia, Prov. Pursat (Osam), 4 May 2010 (Bae, Chae and Vi), gen. slide no. CIS-6069 / Park.

The wing pattern of this species is similar to T. acrifera (Meyrick) described from Nepal, T. sirtalis Wu described from China, T. rectlinea Park described from Taiwan, and T. nabiella Park described from Vietnam, but they can be easily distinguished from each other by the different shapes of their male genitalia. The male genitalia of the new species are allied to those of T. loeica Park, but can be distinguished by the slender uncus and the shorter cucullus. The gnathos of the male genitalia resembles that of T. sirtalis Wu or T. octavana (Meyrick), with a small apical tip of the median process; however, the forewing patterns can be easily distinguished from each other.

Adult (Figure 2M–O). Wingspan 16 mm. Head and thorax dark fuscous dorsally. Basal segment of antenna elongate, greyish orange speckled with dark fuscous scales; flagellum orange grey. Second segment of labial palpus long, thickened with rough scales, dark fuscous in basal half and paler towards apex on outer surface, orange white on inner surface; third segment slender, longer than second. Forewing dark fuscous in basal two-fifths of length, greyish orange medially, fuscous beyond postmedian line; blackish discal stigma at end of cell and a slightly larger one below it; apex obtuse; termen nearly straight, blackish scales along margin; venation with R 2 closer to R 3+4 than R 1; R 3 and R 4 stalked for basal thre-fifths; R 4 and R 5 stalked beyond threequarters; R 5 to termen; M 2 close to M 3 at base; M 3 and CuA 1 stalked for basal third. Hindwing broader than forewing, pale brownish grey; apex more or less obtuse; termen sinuate; fringe same colour throughout, with narrow orange-white basal line; venation with M 3 and CuA 1 short stalked. Hind tibia with dark-brown scales dorsally, with white-orange apex. The female was not found.

Male genitalia (Figure 3M–O). Similar to those of T. octavana (Meyrick), but distinguished by the aedeagus: more slender and without a bundle of needle-like cornuti. Uncus slender, heavily sclerotized with acute apex. Median process of gnathos long, stout, nearly straight, bent at extremity. Valva foot-shaped; costa strongly angled at basal quarter; cucullus nearly quadrate, densely setose; outer margin gently rounded. Juxta shield-shaped; caudal margin slightly concave. Aedeagus as long as valva, gently curved and narrowed towards apex; cornuti consist of two narrow sclerotized plates ventrally and dorsally, and a broad plate bearing spinules at middle.

Cambodia (Pursat Prov.).

The species name is derived from the country name of Cambodia.