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Idaea aversata
The species has a wingspan of 30 - 35 mm. The wings are buff or cream with dark fascia. Two main forms exist, equally abundant: One has darker shading between the central fascia (as in the picture), the other has not. The adults fly at night from June to August, occasionally later, and are attracted to light. The larva is brown, tapering towards the front, and feeds on a variety of plants including bedstraw, chickweed, dandelion and knotgrass. The species overwinters as a small larva.
It is an abundant species in Europe, the Near East and North Africa, its distinctive outline familiar at lighted windows.
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