Sterrhinae

Sterrhinae is a subfamily of moths in the family Geometridae, commonly known as geometer moths. It is a large and diverse group with a worldwide distribution, especially rich in temperate regions and many tropical habitats. The subfamily includes several tribes, among them Scopulini, which contains the well-known genus Scopula. Morphologically, Sterrhinae moths are typically small to medium-sized, with slender wings held flat when at rest. The forewings often have a pale ground color with fine, wavy crosslines and relatively subdued markings, providing camouflage against bark and lichens. Wing venation and genitalia characteristics are used to diagnose taxa within the subfamily.

Larvae (caterpillars) of Sterrhinae are usually herbivorous and feed on a range of herbaceous plants and low shrubs. Some species are specialists, while others are generalists. The caterpillars are often green or brown and, like many Geometridae, move in a characteristic looping fashion, earning the common name “inchworms.” Adults are predominantly nocturnal and are attracted to light; many species exhibit seasonal flight periods.

Taxonomically, Sterrhinae has been subject to revision as molecular studies clarify relationships among geometer moths. The subfamily is generally recognized as a distinct grouping in modern classifications, though the boundaries of tribes and genera within Sterrhinae continue to be refined by researchers.