Drymonia ruficornis, the lunar marbled brown, is a moth of the family Notodontidae.

Forewing dark grey-brown, the dark pre-and postdiscal zigzag bands as in querna but closer together, particularly at the hind margin, edged with white on the proximal and distal sides respectively; the median area between the transverse bands paler grey, bearing a sharp black luniform discal spot ; in the marginal area a whitish undulate line, which is frequently obsolete.

(45e), is intermediate between grisea and true chaonia [ruficornis] ; the whitish colour is restricted to the outer half of the median area beyond the cell and usually interrupted in the centre into a costal and a hindmarginal patch.

Larva pale green, with 4 equidistant chrome-yellow longitudinal lines, of which the 2 dorsal ones are sometimes whitish, the lateral ones on a level with the black-edged spiracles.

Pupa black-brown with lighter segmental incisions; in the ground in a cell lined with silk.