Acosmeryx naga
Diagnostic description:
The most conspicuously marked species of the genus, easily distinguished by the pattern of its forewing. Forewing upperside with a brown discal band extending from the costa towards the middle of the distal margin, sharply defined anteriorly, the triangular area anterior to it grey; a well-defined, grey submarginal band running more or less straight from vein Rs4 to the tip of 1A+2A. Antenna long.
Male genitalia: Gnathos parallel-sided. Harpe with process quite acute distally, resembling a hand with the thumb lying alongside the forefinger, with the other fingers curved back and upwards. Phallus with left lobe shorter than in all other species of Acosmeryx.
Femlae genitalia: Ostial plate similar to that in Acosmeryx anceus anceus.