Tactusa similis Fibiger
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|Tactusa similis Fibiger|
Tactusa similis Fibiger , new species
( Plate 4, figure 1; female genit. plate 23, figure 1)
Material examined. Holotype: female, Thailand NW, Chiang Mai, 750 m, 11.xii.1985, leg. M.G. Allen, BM 1986-74, genit. prep. 3200 M. Fibiger, coll. BMNH.
Diagnosis. Imago (external). Wingspan: 10 mm.
Forewing: relatively short and narrow; ground colour yellowish white, with basal-costal patch and dorsomedial triangular patch; white between basal and antemedial lines, and narrowly white between triangular patch and subterminal line; subterminal and terminal areas, including fringes blackish brown, except for two small beige areas near costa (apo.).
Crosslines: absent, except weakly marked subterminal and terminal lines (apo.).
Reniform stigma: invisible (apo.).
Hindwing: whitish, with indistinct discal spot.
Underside: unicolorous grey.
Abdomen: whitish, with black crest dorsally on first segment.
Posterior apophyses: slightly longer than anterior apophyses and ovipositor.
Anterior apophyses: slightly longer than 8 th abdominal segment.
Ostium: displaced to left; positioned prominently posterior on 8 th segment (apo.).
Antrum: cylindrical, very short, 1.5 times longer than wide (apo.).
Ductus bursae: membranous; narrow; coiled; very long, 3 times longer than diameter of corpus bursae.
Appendix bursae: arising anteriorly from ductus bursae, immediately after antrum.
Corpus bursae: globular.
Signum: cross shaped.
Differential diagnosis. T. similis differs from other Micronoctuidae from SE Asian and Oriental regions in shape of large patch of forewing, weak subterminal and terminal lines; in female genitalia, posteriorly positioned ostium, very short antrum and very long, coiled ductus bursae.
Distribution. Known from one specimen from N Thailand.
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