Blue-spotted Dusk-hawker

Scientific name: Gynacantha japonica

Habitat: pond and stream with canopy cover 

Body length: 68-76 mm

Distribution in Hong Kong: Mainly in north New Territories, e.g. Sha Lo Tung , Pat Sin Leng, Wu Kau Tang

Flight period in Hong Kong: May to December

Similar species: Ryukyu Dusk-hawker, Dingy Dusk-hawker 

Identification features: 

1. Mesepisternum without apparent stripes

2. Dorsum of synthorax near the base of forewings with a pentagonal spot 

3. Abdomen slender