Somatina purpurascens is a moth of the family Geometridae. It is found in Sri Lanka.
Somatina purpurascens Wikipedia
Wingspan is about 34mm in male and 36mm in female. Antennae of male finely ciliated. Hind leg of male small. Tibia dilated with a fold and large tuft of long hair. Whitish moth with slight rufous and fuscous suffusion. Head blackish. Fore wings with rusty costa. A medial sinous line present, which angled below costa, with another line beyond it produced to points beyond the angles of cell and approaching the medial line below the cell, the area between them usually tinged with rufous and with a cell-spot. There is a sub-marginal waved line produced to a point below costa, then usually obsolescent, the area beyond it rufous as far as the marginal rufous band of triangular marks, which does not extend to the costa. Hind wings with cell-speck and traces of waved medial and postmedial line. The outer area fuscous, with marginal series of triangular rufous marks.