Dragonfly (Leptogomphus hongkongensis):

This dragonfly is one of three that are endemic to Hong Kong (new to science and discovered in Hong Kong).

Dragonfly (Orthetrum triangulare triangulare):

The Orthetrum triangulare triangulare can be very difficult to differentiate from the Orthetrum Glaucum (below). This is how you can tell the difference between the two species:

Both O. glaucum and O. triangulare triangulare are widespread in Hong Kong. At present, the former is regarded as an abundant species while the later as a common species. O. glaucum can be distinguished from O. triangulare triangulare by the smaller patch of dark amber at the base of the hind wing and narrower abdomen in both sexes. For mature male, the black tip of the abdomen is less extensive in O. glaucum (usually not beyond the 8th abdomenal segment) than in O. triangulare triangulare. The color of the thorax of male O. glaucum becomes pruinosed pale blue with age while that of O. triangulare triangulare is black. As the color of both male and female of these species vary with age, it may be hard to distinguish them by color alone. Besides, subadult male and female of these species also look similar.

Blue Marsh Hawk (Orthetrum Glaucum):

The Blue Marsh Hawk is also known as the Common Blue Skimmer.

Pictured below is the male Blue Marsh Hawk (Orthetrum Glaucum).

Pictured below is the male sub-adult Common Blue Skimmer.

Pictured below is the female Blue Marsh Hawk (Orthetrum Glaucum).

Pictured below are mating Blue Marsh Hawk (Orthetrum Glaucum) dragonflies.

Orthetrum sp.:

Indigo Dropwing (Trithemis festiva):

Crimson Dropwing (Trithemis aurora):

Pictured below is a male Crimson Dropwing (Trithemis aurora) dragonfly.

Red-faced Skimmer (Orthetrum chrysis):

Wandering Glider (Pantala flavescens):

The Wandering Glider is considered to be the most widespead dragonfly on the planet. It is up to 4.5cm long and has a wingspan of between 7.2 and 8.4cm.

Ground Skimmer (Diplacodes trivialis):

These dragonflys are commonly found perched on the ground. The female is a greenish yellow color and the male is a pale blue. It is also known as the Blue Percher.