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.