Keroplatidae, Macroceridae; ~Mycetophilidae. Adult insects. Slender-bodied; stilt-legged. Antennae 816 segmented; simple. Antennae not aristate. Ocelli present. Eyes not meeting. The maxillary palps 35 segmented; drooping. Wings without a discal cell; without a sub-apical cell; without a closed anal cell. Sub-costa apparent; reaching the costa independently of vein 1 (Orfelia). The leading edge veins markedly stronger than the rest (?). Wings with the lower calypter much reduced or absent. Tibiae apically spurred. Feet without a triple pad. Abdomen constricted basally. Larvae and pupae. Larvae terrestrial; eucephalic. Pupa without a puparium. Classification. Suborder Nematocera; Division Bibionomorpha; Superfamily Sciaroidea. British representation: Genera 15; 52 species.