(Plate 2, figure 4; male genit. plate 13, figure 1)

Material examined. Holotype: male, Vietnam N, Prov. Nghe An, Da Lat, Que Phong district, Ban Khom, 19’40’542 N, 104’54’147 E, 280 m, 21–23.i.1999, leg. L. Peregovits & L. Ronkay, coll. HNHM.

Paratype: 1 male with same data as holotype, coll. & genit. prep. 3948 M. Fibiger.

Taxonomic notes. T. peregovitsi is a member of the trigonifera species-group, which has a blackish triangular or quadrangular patch between the antemedial and postmedial lines; the typical Tactusa ampulla; and a prominent, long, heavily sclerotised anellus, which is still totally fused to juxta.

Diagnosis. Imago (external). Wingspan: 13 mm.

Forewing: ground colour yellowish brown, with acutely-angled, triangular, blackish patch in upper medial area; and black subterminal area, medially extended towards base (apo.).

Crosslines: only subterminal and terminal lines indicated, latter with interneural black spots.

Reniform stigma: well marked, white.

Hindwing: dark grey, with indistinct discal spot.

Underside: unicolorous grey.

Male genitalia. Tegumen: narrow.

Vinculum: strongly built.

Saccus: short, strongly built, broadly V shaped.

Fultura superior: membranous.

Valva: slightly asymmetrical.

Ampulla: forming a cross with axis of valva, slightly asymmetrical, both distally emarginate (apo.).

Digitus: present; fingerlike, pointed at tip (apo.).

Juxta and anellus plate: fused; anellar plate huge, long and clublike; apical half free from diaphragm (apo.).

Phallus long, narrow, strongly curved and coiled, with small carina-spine, and an equally small subapical spine (apo.).

Vesica: without cornuti.

Female genitalia. Unknown.

Differential diagnosis. T. perogovitsi differs from other Micronoctuidae from SE Asian and Oriental regions in shape of black subterminal band, and in male genitalia, shape of digitus, huge, clublike anellus and two small spines on phallus.

Distribution. Known from just two male specimens from N Vietnam.