Meganoton nyctiphanes
Size variable. Forewing with outer margin undulate. Eye large. Palpus very large, with 3rd segment distinct. Foretarsus with 1st segment as long as segments 2-4 combined. Hindtarsus segment 1 with 2nd row of spines beginning in basal quarter. Forewing upperside with ground colour variable: when paler, the lines appear more prominent. Hindwing upperside with pale band slightly variable in position. Abdomen with 8th segment laterally tufted; stridulatory curtain present on inner surface of each side.
Male genitalia: Uncus long, compressed, carinate ventrally, highest beyond middle, strongly curved at base, then nearly straight to apex where it is again curved; tip truncate. Gnathos with lobe broad, long, flat, slightly curved dorsad, deeply sinuate, each half rounded externally, angled at the sinus. Valve broad, dilated dorsad in basal half, the long hair-scales of the dorsal margin and the scales proximal to a patch of modified scales white; the patch of modified scales large, clay-coloured, the scales small, close together, longer than broad, somewhat narrowed apically, bidentate. Harpe with a spatulate process, which is curved dorsad apically, the oblique upper edge irregularly notched and toothed. Phallus with 2 long processes close together, the longer one denticulate.
Female genitalia: Ostial plate much folded, raised mesially from base to ostium. Ostium with proximal edge raised into a double tubercle.
Meganoton nyctiphanes was recorded from Wuyi Shan, Fujian, China, by Lin & Lin (2011). This represents a major range extension and requires confirmation; it may be a misidentification of Psilogramma distriga discistriga. Records from Ahwa, Surat Dangs, Gujarat (Shull & Nadkerny, 1964) and Pindrabera, Dalma Wildlife Sanctuary, Jharkhand, India ( Sambath, 2014) may also be misidentificatons but are provisionally accepted as they could be reasonable extensions to the confirmed range of the species.