Scientific name: Prodasineura croconota

Habitat: slow-flowing woodland stream

Body length: 38-40 mm

Distribution in Hong Kong: Wu Kau Tang, Bride’s Pool, Sha Lo Tung

Flight period in Hong Kong: April to September

Similar species: Black Threadtail(Comparison: female)

Identification features (male):

1. Large area of synthorax orange

2. Abdomen black

3. Superior anal appendage white

Identification features (female):

1. Synthorax black

2. Two white or pale orange stripes at two sides of synthorax

3. End of yellow spots at two sides of the 2nd abdominal segment not hook-like