Enpinanga borneensis
Strongly sexually dimorphic.
Male: Forewing outer margin smoothly curved, not scalloped posterior to M3 as in Enpinanga assamensis and Enpinanga vigens. Forewing upperside ground colour pale grey; discal spot with a rounded dark broad spot basad of it and a rectangular dark brown spot distad of it running from M3 to the costa, a slightly transparent cream spot on the postmedial line between CuA1 and CuA2. Forewing underside paler than in Enpinanga assamensis or Enpinanga vigens, lacking red areas proximal to the ragged submarginal line. Hindwing upperside almost uniformly dark brown, buff medial band barely visible in tornal third of wing.
Female: Forewing upperside ground colour greyish brown; medial line diffuse, dark brown; submarginal line serrate, edged in dark orange brown, which colour expands near the costa to fill the triangle between the submarginal line, costa and the apical stripe; discal spot inconspicuous or absent. Hindwing upperside with a distinctive broad, straw coloured, inner margin, as in the male.
Male genitalia: Uncus twice length of gnathos, more strongly curved apically than in Enpinanga vigens. Gnathos less clearly sinuate than in Enpinanga vigens. Valve with a row of stridulatory scales. Harpe very short, obliquely truncate but individually variable. Phallus process short, extends basally as a ridge along the aedeagus, with numerous apical teeth.