Catharylla bijuga is a moth of the Crambidae family. It occurs in lowlands in the Guianas and Brazil. The length of the forewings is 9–10.5 mm for males and 11–15 mm for females. The forewings are snow white, with a yellow ochreous to brown costal margin, partially disrupted when meeting the transverse lines. The hindwings are snow white, the veins slightly ochreous.