Luminous spots localized posteriorly, round, visible also on the proepisternum (in males they are smaller than in females).
Abdominal luminous organ usually median sized; frequently less developed or vestigial in the female.
Elytra weakly punctate-striate, sides and apices marginated; in female less punctulate.
Female genitalia: bursa copulatrix with a single spiral and a few long spines; median oviduct without sclerotized plates; accessory glands little developed.
Sexual dimorphism extremely accentuated; in addition to the characters already referred to, the female has vestigial hind wings.