Male body length 17-22 mm, the largest firefly in Hong Kong; windows at the posterior part of the pronotum distinct, lunate; light organs transverse, located at 6th and 7th ventrite. Female body length 32-47 mm, bearing a pair of short and small elytra, shape varies, light organs rounded, one pair at 6th abdominal ventrite, another pair at 7th. Larva black, body length of the largest record 65mm; irregularly scattered with small light brown spots, a pair of light organs located at 8th abdominal segment. Lateral sides of the last 2 tergites almost straight, different from the rounded lateral sides of the last 2 tergites in Pyrocoelia analis.
Distribution
：More than 10 locations of lowland and highland natural woodlands as well as highland grasslands have records
.
Adult flight period
：
Late October to early December
Other information
：
Male
flies slowly, showing continuous glow, appears late, about 1 hour after sunset, keeps active for about 3 more hours. Female is very rarely recorded. Larva feeds on snails. Endemic to Hong Kong.
雄 Male 雌 Female 幼蟲 Larva 雄 Male 雄 Male 雄 Male 雄 Male 雄蛹 Male pupa 雌 Female (右 right) 雄 Male (左 left) 雌 Female 雌 Female 雌 Female 雌蛹 Female pupa 幼蟲 Larva 幼蟲 Larva 幼蟲 Larva 幼蟲捕食蝸牛 Larva predating a snail 幼蟲末節 Terminal segments of a larva
