Emerald Cascader

Scientific name: Zygonyx iris insignis

Habitat: fast-flowing stream

Body length: 57-61 mm

Distribution in Hong Kong: Widespread, e.g. Sha Lo Tung, Wu Kau Tang, Tai Po Kau, Mui Wo, Cheung Chau

Flight period in Hong Kong: April to November

Similar species: Chinese Cascader (Comparison)

Identification features (male): 

1. Two yellow stripes at two sides of synthorax (yellow stripes turn dark brown in aged individuals)

2. Abdomen mainly black

Identification features (female): 

1. Two yellow stripes at two sides of synthorax

2. Abdomen mainly black

3. Wingbase without apparent colored spots