Aenetus cohici is a moth of the family Hepialidae. It is endemic to New Caledonia. The wingspan is 107–121 mm. There are two colour morphs. The first has a background colour of yellowish-green with pastel violet spots. The second morph has a greyish-green background colour with yellowish-green patches faintly visible as transverse rows and pastel violet spots on the costal margin. The hindwings are pale orange in the basal area, blending into orange-white over the remainder of the hindwing.