Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae Author FIBIGER, MICHAEL text Zootaxa 2010 2010-08-31 2583 1 1 119 http://dx.doi.org/10.11646/zootaxa.2583.1.1 journal article 10.11646/zootaxa.2583.1.1 1175­5334 10094382 Tactusa biartus Fibiger , new species ( Plate 3 , figure 7 (imago), 8 (wing preparations); male genit. plate 13, figure 5) Material examined. Holotype : male, Thailand NW, Chiang Mai , Doi Suthep-Pui Nat. Park , San K , 1540 m , 22.iv.–6.v.1994 , leg. I.J. Kitching et al. , BMNH (E) 1994-97, wing prep. 3198 & genit. prep. 3403 M. Fibiger , coll. BMNH . Diagnosis. Imago (external). Wingspan: 11 mm . Wing venation: in both wings, typical for Micronoctuidae (see plate 3, fig. 8). Forewing: relatively short and narrow; ground colour yellowish, with basal-costal patch and dorsomedial, triangular patch; yellowish between basal and antemedial lines, and between triangular patch and subterminal line; subterminal and terminal areas, including fringes, blackish brown, except for beige costal patch (apo.). Crosslines: subterminal line indicated, white; terminal line weakly marked. Reniform stigma: invisible (apo.). Hindwing: whitish, with indistinct discal spot. Underside: unicolorous grey. Abdomen: whitish with black crest dorsally on first segment. Male genitalia. Tegumen: relatively strongly built. Vinculum: even more strongly built. Saccus: short; strongly built, V shaped. Fultura superior: membranous. Valvae: slightly asymmetrical, one on right broader. Ampulla: forming a cross with axis of valva; prominently asymmetrical; slightly upturned; broadest by valva; arms relatively broad, dorsal arm shorter, broader; apically with small, stout spines, and ventral arm longer, narrower, tapered (apo.). Digitus: absent (apo.). Juxta and anellus plate: slightly asymmetrical, fused, constricted medially (apo.). Phallus: strongly enlarged by ductus ejaculatorius, tapered from middle, and distally forming a long, narrow, curved, smoothly upturned cylinder. Vesica: unarmed. Female genitalia. Unknown. Differential diagnosis. Given under T. artus . Distribution. T. biartus known only from N. Thailand .