Male body length 8-9 mm; antennae unipectinate, with very long branches. Light organ inconspicuous. Female 17-20mm long, wingless, light organ indistinct. Each tergite of larva largely covered by black mark, with red mark in the middle and lateral sides. A pair of light organ located at the 7th abdominal segment.
：Deep Water Bay (HK Island), Tai Po Kau, Tsuen Kam Au, Ng Tung Chai, Wong Cheuk Yeung (Sai Kung)
, Ho Chung.
Adult flight period
Late October to late January
：Ocassionally, a pair of very dim light spots are visible from the ventral side of male abdomen. Whole body of the female glows weakly
, and in rare cases, a pair of much brighter light spots are visible from the 7th abdominal segment. Larvae feed on earthworms.
雄 Male 雄 Male
雄 Male 雄 Male 雌 Female (下 below) 雄 Male (上 above) 雌 Female