Male body length 10mm, elytra slender, compound eyes very large, with a prominent indentation. Light organ absent in adult male. Female body length 9-13 mm, wingless, larviform, no conspicuous colour mark. At night, posterior end of abdomen curls up to show its very large light organ, emitting continuous light.
Tai Mo Shan, Mui Tsz Lam (Shatin)
Adult flight period
Late December to early March
After oviposition, female shows 33 light spots and surrounds the eggs. In cold winter when air temperature drops to 12
C, female still shows its light in the wild. Larvae predate on millipedes.