Udea melanephra is a moth in the family Crambidae. It was described by George Hampson in 1913. It is found in Colombia[1] and Bolivia.[2]
The wingspan is about 24 mm. The forewings are ochreous, irrorated with a few blackish scales and with an indistinct sinuous dark antemedial line. There is a faint brown annulus in the middle of the cell and a prominent black discoidal lunule with a slight brown striga in the centre. There is a black point above it on the costa. The postmedial line has a black spot at the costa and there is a series of black points on it, incurved and with small black spot at the discal fold, below vein 4 bent inwards to below the end of the cell, then again excurved. The terminal area is suffused with rufous with a series of black points on the costa towards the apex and on the termen. The hindwings are creamy white, the terminal area tinged with rufous from the costa to vein 2 and there is a small black spot at the upper angle of the cell and a point at the lower angle. There is a terminal series of points from the apex to vein 2.[3]