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General DescriptionA pale grey geometrid with indistinct markings. AM, PM and median dark lines usually present, the PM widest and slighltly darker. Patchy brown band distal to the PM band variably developed. Discal spot usually well-defined. Hindwings paler than the forewings, PM band usually visible. Females have vestigial wings and are flightless. Similar to I. anataria and exauspicata; loricaria males have larger antennal pectinations giving a more feathery appearance, and females have vestigial wings. The forewings of exauspicata are also wider, and lack the more pronounced concavity of the forewing apex of anataria, giving the latter more notched appearing forewings. The forewing costal marks of loricaria are concolourous with the transverse lines, not darkest at the costa as in anataria and exauspicata. This species is Holarctic; North American populations are subspecies julia (Hulst).