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.
Distribution
：
Tai Mo Shan, Tsuen Kan Au, Mui Tsz Lam (Shatin), Sha Tin Pass, Quarry Pass (Mount Paker)
Adult flight period
：
Late December to early March
Other information
：
After oviposition, female shows 33 light spots and surrounds the eggs. In cold winter when air temperature drops to 12
o
C, female still shows its light in the wild. Larvae predate on millipedes.
