Male body length 10-12 mm, compound eyes very large, elytra tip black; similar to Pteroptyx maipo, but the elytra of Pteroptyx maipo are deflexed and body is significantly smaller in size. Light organs almost completely occupy ventrite 6 & 7. Female resembles male, except generally large than male, and only one light organ occupying ventrite 6. Each tergites of larva bear 4 sharp projections from the posterior margin, there is a pair of yellowish brown makings at the pronotum anterior region.
Distribution
：
Kam Tin, Shui Tsan Tin, Tai Po Kau, Bride's Pool, Wu Kau Tang, Sha Lo Tung.
Adult flight period
：
April to September
Other information
：
Often recorded in abandoned farmlands, sometimes in very large number, hundreds to thousands appear at the same time.
雄 Male 雌 Female 幼蟲 Larva 雄 Male 雌 Female 雌 Female 幼蟲 Larva 雄螢閃光模式 Male flash pattern 雄螢閃光 Male flashes 雄螢閃光 Male flashes 雄螢閃光 Male flashing
