Semioscopis aurorella forewing colouration is variable, ranging from yellow-gray to pale yellow-white (Hodges 1974). Some individuals may have darker forewings but the costal margin is generally gray-brown and flecks of gray scales (Hodges 1974). Forewing length is generally between 11 to 14 mm (Hodges 1974). The aedeagus of male S. aurorella is twice as long as the basal width with short, curved cornuti (Hodges 1974).