Spilosoma semperi is a moth of the family Erebidae.

[1] 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 ochreous 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.