Scientific name: Zygonyx asahinai

Habitat: fast-slowing stream

Body length: 56-65 mm

Distribution in Hong Kong: Scatteredly distributed the New Territories, e.g. Hok Tau, Ng Tung Chai, Shing Mun Country Park

Flight period in Hong Kong: May to August

Similar species: Emerald Cascader (Comparison)

Identification features (male):

1. Two yellow stripes at two sides of synthorax

2. Abdomen mainly black

Identification features (female): 

1. Two yellow stripes at two sides of synthorax

2. Abdomen mainly black

3. Amber spots at wingbase and wingtip in young individuals