Comparison of Similar Species

(Photo sorting: left to right, top to bottom)

Pale-spotted Emperor

1. A black triangular spot at where the frons sticks to the compound eyes

2. Synthorax green with no apparent stripes at two sides

4. Spots on abdomen dot-like

 

Blue-spotted Emperor

1. “工”-shaped black spot on the frons

2. Synthorax green, two sides with apparent black stripes

4. Spots on abdomen dot-like

 

Lesser Emperor

1. Two black stripes on the frons

2. Synthorax green, without apparent stripes on two sides

4. Spots on abdomen strip-like

 
 

Blue-spotted Dusk-hawker

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

 

Ryukyu Dusk-hawker

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

 

Dingy Dusk Hawker

2. Dorsum of synthorax near the base of forewings with a rhombus-shaped spot

 

Tiger Hawker

1. Frons yellowish green

2. Compound eyes green

 

Beak-tailed Hawker

1. Frons white

2. Compound eyes blue in male

 

Common Flangetail

1. Legs all black

2. A pair of black leaf-like projections on the 8th abdominal segment, which are smaller in female

 

Golden Flangetail

1. Femur yellow

2. A pair of black leaf-like projections with yellow spot on the 8th abdominal segment

 

Hainan Hooktail

1. Synthorax ridge without yellow stripe

2. Two yellow stripes at two sides of synthorax respectively

3. Yellow spot on the 7th abdominal segment

4. Superior anal appendage and inferior anal appendage form a complete ring in male

 

Guangdong Hooktai

1. Synthorax ridge without yellow stripe

2. Two yellow stripes at two sides of synthorax respectively; Apparently disconnected thin yellow between thick yellow spots

3. Large white spot on the 7th abdominal segment

4. Superior anal appendage and inferior anal appendage form a “C” in male

 

Chinese Hooktail

1. Yellow stripe on synthorax ridge

2. Two yellow stripes at two sides of synthorax respectively, and some individuals with small yellow spot between yellow stripes

3. Large yellow spot on 7th abdominal segment

4. Superior anal appendage and inferior anal appendage form a “C” in male

 

Regal Pond Cruiser

1. Broad antehumeral stripes on synthorax

2. Apparent small yellow transverse stripes on the dorsum of the 8th abdominal segment in some individuals

 

Angle-winged Cruiser

1. Synthorax without antehumeral stripe

2. The 8th abdominal segment all black

 

South China Cruiser

1. Antehumeral stripes on synthorax, but thinner than those of Regal Pond Cruiser

2. Dorsum of the 8th abdominal segment without yellow spot

 

Club-tailed Cruiser

1. Antehumeral stripes on synthorax, but thinner than those of Regal Pond Cruiser

2. Two yellow spots on the dorsum and abdomen of the 8th abdominal segment respectively

 

South China Shadow-emerald

1. Legs all black

 

Dancing Shadow-emerald

1. Tibia yellow or yellowish brown

 

Spangled Shadow-emerald

1. Several yellow spots on two sides of synthorax

 

Common Shadow-emerald

1. Two yellow stripes at two sides of synthorax respectively

 

Crimson Darter (Male)

3. Legs red

 

Ruby Darter (Male)

3. Legs black

 

Blue-tipped Percher (Female)

2. M-shaped spot on dorsum front of synthorax

 

Blue Percher (Female)

2. Synthorax with black vertical stripes, but not connecting to form m-shape on dorsum front

 

Black Marsh Skimmer (Male)

2. Two black vertical stripes on the dorsum of abdomen

 

Indigo Dropwing (Male)

2. Dorsum of abdomen without apparent black vertical stripes

 

Red-faced Skimmer (Male)

1. Frons red

 

Common Red Skimmer (Male)

1. Frons dark brown

 

Common Blue Skimmer (Male)

1. Frons dark brown

4. Amber spot in wingbase of hindwing

 

Marsh Skimmer (Male)

1. Frons blue white

4. Wingbase of hindwing without apparent spot

 

Mangrove Skimmer (Male)

1. Alternating black and white stripes on frons

4. Wingbases of hindwings without apparent colored spots

 

Lesser Blue Skimmer (Male)

1. Frons black

4. Black spot on wingbase of hindwing

 

Common Blue Skimmer (Female)

2. Two yellow stripes at two sides of synthorax; a disconnected yellow spot at the end of the 1st stripe

 

Marsh Skimmer (Female)

2. Synthorax with a brown antehumeral stripe

 

Mangrove Skimmer (Female)

2. More than two thin yellow stripes at two sides of synthorax

 

Lesser Blue Skimmer (Female)

2. Two yellow stripes at two sides of synthorax; a disconnected yellow spot may appear at the end of the 1st stripe

 

Wandering Glider (Female)

2. Wings without apparent colored spots

3. Tear-shape black spots on the 8th to 10th abdominal segment

 

Evening Skimmer (Female)

2. Brown spots at hindwings near wingbases

3. Dorsum of abdomen without black spots