Blomer’s rivulet (Venusia blomeri) is a member of the Geometridae family of moths, in the subfamily Larentiinae which includes the carpets and pugs. Like most geometers the moth rests with its wings open and this reveals its main distinguishing feature — a rusty-brown patch covering the apex of the upper surface of the forewing, which contrasts with the pale grey colour of the rest of the wings. When seen up close there are faint blackish cross lines too. The species has a large world range, occurring from France, Britain and Scandinavia through eastern Europe and Russia to China and Japan.