Scientific name: Heliocypha perforata

Habitat: fast-flowing stream

Body length: 28-31 mm

Distribution in Hong Kong: Widespread, e.g. Bride’s Pool, Wu Kau Tang, Tai Po Kau, Mui Wo

Flight period in Hong Kong: March to November

Identification features: 

1. Clypeus protruding

2. Abdomen shorter than wings