Tactusa biartus Fibiger
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|Tactusa biartus Fibiger|
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,
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.
Female genitalia. Unknown.
Differential diagnosis. Given under T. artus .
Distribution. T. biartus known only from N. Thailand.
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