Eupithecia is a large genus of moths of the family Geometridae. There are hundreds of described species, found in all parts of the world (45 in the British Isles alone), and new species are discovered on a regular basis. Eupithecia species form the bulk of the group commonly known as pugs. They are generally small with muted colours and specific identification can be difficult. As a group they are easily identified by their narrow wings held flat at 90° to the body with the hindwings almost hidden behind the forewings.