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Spilosoma semperi is a moth of the family Erebidae. It was described by Walter Rothschild in 1910. It is found on Sumatra and Peninsular Malaysia.
Male
Head and thorax pale fulvous yellow; palpi crimson, black at tips; sides of frons and antennae black; pectus in front blackish, some blackish and crimson below shoulders; fore coxae crimson; (legs wanting); abdomen crimson, the ventral surface pale ochreous, lateral series of slight blackish points. Forewing pale oehreous yellow; small postmedial black spots above and below vein 1. Hindwing yellowish white, the inner area rather yellower; a small black discoidal spot. Underside of forewing with black discoidal lunule and oblique blackish postmedial striae from vein 5 to below vein 3; hindwing with the costal area yellower.
Wingspan 44 mm.