Scientific name: Ischnura senegalensis

Habitat: marsh, pond

Body length: 28-30 mm

Distribution in Hong Kong: Widespread, e.g. Long Valley, Hong Kong Wetland Park, Tsiu Hang

Flight period in Hong Kong: throughout the year

Identification features (male):

1. Synthorax green or blue

2. The 8th abdominal segment blue

3. Dorsum of the 9th abdominal segment black, ventral blue

Identification features (female): 

A1. Synthorax green or blue

A2. The 8th abdominal segment blue

A3. Dorsum of the 9th abdominal segment black, ventrum blue

Or

B1. A black stripe at dorsum of synthorax

B2. A brown stripe at two sides of synthorax respectively

Or

C1. Synthorax orange

C2. A black stripe at dorsum of synthorax

C3. The 1st to 2nd abdominal segment orange