Marumba sperchius (Taxonomy)
Erroneously synonymized with Polyptychus dyras by Hampson, [1893], Fauna Brit. India1: 69. Reinstated as a species by Rothschild & Jordan, 1903, Novit. zool.9 (suppl.): 269 (key), 280. Transferred to Marumba by Kirby, 1892, Synonymic Cat. Lepid. Heterocera1: 706.
Similar to Marumba juvencus, but the lines of the forewing and the ground colour of the hindwing are more reddish and the lines on either side of the weak discal spot hardly converge, whereas they converge distinctly in Marumba juvencus. Forewing underside with tornus suffused with rufous; unlike situation in Marumba juvencus and Marumba tigrina the apex is not dark brown. Hindwing underside with lines much less sinuous than in Marumba juvencus and Marumba tigrina. Uncus rounded at sides, not deeply divided and with resulting sinus narrow, lobes notched.Gnathos narrow, long. Valva with dorso-apical lobe dagger-shaped; processes of subdorsal basal fold very long and slender. Harpe notched irregularly and with tubercles. Sterigma with a rounded lobe at each side of ostium bursae.