Dorycnopa marmorea is a moth of the family Gelechiidae. It was described by Oswald Bertram Lower in 1899. It is found in Australia, where it has been recorded from New South Wales.[1]
The wingspan is 8–10 mm. The forewings are white with two irregular oblique pale fuscous parallel fasciae, the first from the costa near the base to one-fifth of the inner margin. The second just beyond. Both fasciae with a few blackish spots on the margins. There is also a fine elongate blackish mark in the middle of the disc and a second in a direct line beyond. There is a pale fuscous patch on the inner margin immediately below and the costa from the second fascia to about five-sixths is pale fuscous, while the apex is fuscous-tinged, more pronounced at the extreme apex. The hindwings are grey whitish.[2]