Macaria brunneata

The Rannoch Looper (Macaria brunneata or Speranza brunneata) is a moth of the family Geometridae. It is found in Siberia, Japan, and northern and mountainous parts of North America, and throughout Europe, though in Britain it is largely or entirely restricted to mature forests in central Scotland.

The wingspan is 25–30 mm. The length of the forewings is 11–13 mm. It flies during the day, and when at rest often holds its wings closed as a butterfly does. The moth flies in June and July in Britain and in July and August in North America.

The caterpillars feed on bilberry in Britain and on that and other plants of the heath family, such as bearberry, in North America.