The Adelidae or fairy longhorn moths are a family of monotrysian moths in the lepidopteran infraorder Heteroneura. The family was first described by Charles Théophile Bruand d'Uzelle in 1851. Most species have at least partially metallic, patterned coloration and are diurnal, sometimes swarming around the tips of branches with an undulating flight. Others are crepuscular and have a drab coloration. Fairy longhorn moths have a wingspan of 4–28 millimeters, and males often have especially long antennae, 1–3 times as long as the forewing.