(Plate 4, figure 6; male genit. plate 14, figure 4; female genit. plate 23, figure 2)

Material examined. Holotype: female, Thailand West, Kanchannaburi, at River Kwai Resotel, 19– 22.vii.2003, leg & coll. M. Fibiger, later to be deposited in ZMUC.

Paratypes: 5 males, 1 female. 1 male with same data as holotype, but genit. prep. 4986 M. Fibiger; 1 male, W Thailand, Prov. Uthai Thani, Khao Nang Rum, 400 m, 17–18.xi.1985, leg. M.G. Allen, BM 1986-74, genit. prep. 3768 M. Fibiger; 1 male, 1 female, Thailand N, 30 km N Mae Hong Son, Karen village, 1100 m, 16.vii.2003, genit. preps 4985 and 4991 M. Fibiger; 1 Malaysia, West Pahang, Genting Tea Estate, 2000 ft., 6.xii.1985, leg. H.S. Barlow, BM 198 -, genit. prep. 3767 M. Fibiger; 1 W Malaysia, Fraser’s Hill Steakhouse, 18.vi.1992, leg. M. Lödl, genit. prep. 4131 M. Fibiger. Colls MF, BMNH, and NMW.

Diagnosis. Imago (external). Wingspan: 10–11 mm.

Forewing: ground colour yellow, with very large triangular patch, including fringes, that extends from antemedial point on costa, to apex and to tornal edge; light-brown triangular patch present subapically by costa (apo.).

Crosslines: parts of postmedial and subterminal lines present, whitish; terminal line indicated by blackish brown interneural spots; parts of fringes basally whitish, together forming a line.

Reniform stigma: hardly traceable.

Hindwing: dark grey, with very faint discal spot.

Underside: unicolorous grey.

Abdomen: grey, with black crest dorsally on first segment; that of female with yellow apical tuft.

Male genitalia. Tegumen: relatively strongly built.

Vinculum: well built.

Saccus: short, strongly built, broadly U shaped.

Ampulla: forming a cross with axis of valva; prominently asymmetrical, broadest by valva; right ampulla much larger, with a sickle-like long, flat process (apo.).

Digitus: present; small; apically rounded; heavily sclerotised (apo.).

Juxta and anellus plate: asymmetrical; fused; rounded; with a deep cleft for phallus (apo.).

Phallus: coecum relatively long, pointed; broad at ductus ejaculatorius; tapered smoothly throughout, and curved upwards (apo.).

Vesica: unarmed.

Female genitalia. Ovipositor: quadrangular with rounded corners.

Posterior apophyses: 1.5 times longer than anterior apophyses and ovipositor.

Anterior apophyses: slightly longer than 8 th abdominal segment.

8 th abdominal segment: sclerotised part ventro-posteriorly close; anteriorly wide (apo.)

Ostium: displaced to left.

Antrum: very short, tapered (apo.).

Ductus bursae: membranous, relatively short, narrow, coiled; as long as diameter of corpus bursae.

Appendix bursae: arising medially from ductus bursae (apo.).

Corpus bursae: large, globular.

Signum: cross shaped.

Differential diagnosis. T. pars differs from other members of second half of species-group in large blackish patch, with a triangular yellow patch by costa; in male genitalia, in shape of ampullae, right one with a very long, curved, flat process; large process of ampulla; in female genitalia, in shape of 8 th abdominal segment; equal length of ductus and corpus bursae.

Distribution. T. pars known from West Thailand, from North to South, and extends to western Malaysia.