Syllepte albirivalis is a moth in the family Crambidae. It was described by George Hampson in 1912. It is found in Papua New Guinea.[1]
The wingspan is about 28 mm. The forewings are cupreous brown with an indistinct oblique whitish antemedial line which is slightly defined on the outer side by fuscous. There is a small white spot in the middle of the cell and a discoidal bar defined by fuscous. There is a postmedial white line arising below the costa, its outer edge very slightly waved to vein 5, where it is very slightly bent outwards, at vein 2 bent inwards to below the end of the cell, then slightly excurved. The hindwings are cupreous brown with a slight whitish discoidal lunule defined by fuscous. The postmedial line is white, faintly defined on the inner side by fuscous, very slightly bent outwards at vein 5, at vein 2 bent inwards and almost obsolete to below the end of the cell, then oblique to above the tornus.[2]