Archiearis notha

Archiearis notha, the light orange underwing, is a moth of the family Geometridae. The species was first described by Jacob Hübner in 1803 and can be found in Europe.
Image:Britishentomologyvolume5Plate121.jpg|thumb|left|200px|Illustration from John Curtis's British Entomology Volume 5
The wingspan is about 35 mm. The moths fly from March to April depending on the location.
Image:Buckler W The larvæ of the British butterflies and [moths PlateCI.jpg|thumb|140px|left|7, 7a, 7b,7c, 7d larvae in various stages of growth]
The larvae feed on aspen, hiding between spun leaves during the day.