Tactusa spadix Fibiger 2010, new species

(Plate 4, figure 5; male genit. plate 14, figure 3)

Material examined. Holotype: male, Laos, Vientiane Prov., Ban Van Eue, 15–31.v.1965, genit. prep. 3316 M. Fibiger, coll. BPBM.

Diagnosis. Imago (external). Wingspan: 12 mm.

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

Crosslines: only terminal lines visible as blackish-brown interneural spots.

Reniform stigma: traceable, yellowish.

Hindwing: dark grey, with indistinct discal spot.

Underside: unicolorous grey.

Vinculum: well built.

Saccus: short, strongly built, broadly U shaped.

Fultura superior: membranous.

Valvae: asymmetrical, that on right prominently broader; right sacculus especially, with huge dorsal, triangular extension, setose at tip (apo.).

Ampulla: forming a cross with axis of valva; asymmetrical; broadest by valva; dorsal left arm broader, rounded; ventral arm equally broad throughout, with small, stout spines at tip (apo.).

Digitus: absent, but with heavily sclerotisation where place for base of a digitus (apo.).

Juxta and anellus plate: asymmetrical, fused, somewhat triangularly ventrally and rounded dorsally, with hole for phallus at right side by rounded edge (apo.).

Phallus: coecum rather short; broad at ductus ejaculatorius; tapered conelike to1/3, almost straight from there to tip (apo.).

Vesica: unarmed.

Female genitalia. Unknown.

Differential diagnosis. T. spadix differs from other members of second half of species-group in large blackish patch with light-brown patches and indistinct reniform stigma; in male genitalia, in huge triangular saccular process, absent digitus, shape of ampulla, ventrally triangular juxta-anellus plate and almost straightphallus.

Distribution. Known from a single specimen from S Laos.