Plagiocrossa is a genus of moth in the family Lecithoceridae. It contains the species Plagiocrossa picrodora, which is found in South Africa. The wingspan is about 11 mm. The forewings are dark purplish-fuscous, with the costal edge whitish-ochreous from before the middle almost to the apex. There is a transverse whitish-ochreous bar in the disc at three-fifths. The hindwings are pale whitish-ochreous, towards the termen and dorsum tinged with grey.