Nephelomilta sumatrana (van Eecke, 1927)

Volynkin, Anton V. & Černý, Karel, 2018, Revision of the genus Nephelomilta Hampson, 1900, with descriptions of twelve new species and two new subspecies (Lepidoptera, Erebidae, Arctiinae), Zootaxa 4472 (3), pp. 401-451 : 406-407

The N. sumatrana species-group

Diagnosis. The sexual dimorphism is more strongly developed than in other subgenera: in the N. sumatrana species-group, females are significantly larger than males. The male genitalia of the species-group are very similar to those of the N. suffusa species-group by to the uncus S-like curved, the broad and rounded apical section of the costa with the broad, trigonal ventral-apical process, and the very broad ventral plate of the costa directed ventrally and having the small trigonal ampulla, but unlike the N. suffusa species-group, the subapical saccular process in the N. sumatrana species-group is present, the carinal plate of aedeagus is band-shaped, weakly sclerotized and has no dentation, and the medial diverticulum of the vesica has a cluster of thin spinules. The female genitalia of the N. sumatrana species-group are unique within the genus in the apophyses anteriores of equal length as the apophyses posteriores. With the exception of the length of the apophyses anteriores, the female genitalia of the N. sumatrana species-group are mostly similar to those of the N. suffusa species-group in the pheromone glands very small and situated dorsally, and the absence of a postvaginal plate, but the ductus bursae in the N. sumatrana species-group is clearly subdivided into the heavily sclerotized antrum and the anterior membranous section, whereas in the N. suffusa species-group the ductus bursae is evenly sclerotized.

Description of external morphology. Body covered with whitish scales. Forewing with whitish ground color and pattern varying from red to orange and consisting of subbasal line W-like dentate and medially broadened, antemedial line loop-like curved between veins R and 1A, broad medial and postmedial lines narrowed and smoothly curved between veins R and 1A, three broad spots in submarginal area, terminal line interrupted into spots on veins which sometimes merged in line, broad medial spot in cell between antemedial and medial lines, and discal spot presented as complex of two spots of different size in males and V-like situated three spots in females; cilia creamy whitish. Hindwing creamy whitish, sometimes with greyish suffusion; discal spot broad, dark grey, diffuse; cilia creamy whitish.