Enpinanga assamensis
Strongly sexually dimorphic.
Male: Forewing outer margin crenulated posterior to M3 (as in Enpinanga vigens and unlike Enpinanga borneensis). Upperside of head and thorax with a broad lateral stripe, darker and thus more prominent than in Enpinanga vigens, as dark as in Enpinanga borneensis, but not, or barely extending onto abdomen. Forewing upperside similar to Enpinanga borneensis but postmedial band dark brown, running from inner edge to CuA2, beyond which it rapidly fades out, and lacking the slightly transparent cream spot on the postmedial line between CuA1 and CuA2. Forewing underside basally mostly red as far distal as the ragged submarginal line. Hindwing upperside similar to Enpinanga borneensis but orange-buff medial band clearly visible across entire wing as far as Rs.
Female: Forewing upperside similar to Enpinanga borneensis but ground colour paler grey and small black circular discal spot conspicuous. Hindwing upperside with outer marginal area darker than rest of the wing, unlike Enpinanga borneensis and Enpinanga vigens, which are much more uniform on the outer margin; inner margin almost uniform, unlike Enpinanga borneensis and Enpinanga vigens.
Male genitalia: Uncus slightly longer than gnathos. Valve with a few stridulatory scales. Harpe a slender, acute, curved process (similar to Enpinanga vigens). Phallus apical process short, parallel-sided, rounded apically, denticulate; twice as long as wide (similar to Enpinanga borneensis).