The forewings are grey-brown with a red or yellow edged cream line along the costa.The hind wings are orange. The head is orange, and the thorax brown. The moth has the natural stiff posture which is characteristic of many LITHOSIINAE, or "Footmen". The adults have a wingspan up to 3 cms.
Palaeosia bicosta is listed in the following regions:
Canberra & Southern Tablelands | Southern Highlands | Albury, Wodonga | South Coast | Barwon South West