This is the only species in the genus Stenarcha, and is restricted to the most southerly parts of Western Australia.
The forewings are narrow and cryptically patterned in grey, black and brown, whilst the hindwings are grey. The male antennae have sparse short pectinations. There are no similar species which occur within the distribution of S. stenopa.
Donnybrook, Porongurup NP, Mundaring, Albany (WA)Biomaps map of <em>Stenarcha stenopa</em> specimens from the Australian Museum database http://www.biomaps.net.au/biomaps2/mapam.jsp?cqn=Stenarcha%20stenopa&cql=sn&csy=Square
Feeding and diet
Larvae probably feed on lichens