Scientific name: Acisoma panorpoides

Habitat: marsh, pond

Body length: 25-28 mm

Distribution in Hong Kong: Widespread, e.g. Hong Kong Wetland Park, Luk Keng

Flight period in Hong Kong:  March to November

Identification features (male): 

1. Mature male blue

2. The 1st to 5th abdominal segment swollen, shaping the abdomen conical

Identification features (female): 

1. Female yellowish brown 

2. The 1st to 5th abdominal segment swollen, shaping the abdomen conical