36. Orthetrum pruinosum (Burmeister, 1839)

Orthetrum pruinosum (Burmeister, 1839)

Number: 36

Family: Libellulidae

Genus: Orthetrum 

Species: Orthetrum pruinosum (Burmeister, 1839) 
Common name: Crimson tailed Marsh hawk

Habitat: Forests, lakes, ponds 

Distribution: Chittagong, Sylhet

Abundance: Common

Flight season: June- November

                                                       Male

The males are spectacular insects with abdominal segments red. The thorax is black, legs are black, wings are transparent, pterostigma black.
  

The matting pair I have spotted from Sylhet. The pair was matting in the reeds associated to the streams.   

35. Neurobasis chinensis (Linnaeus, 1758)

Neurobasis chinensis (Linnaeus, 1758)

Number: 35

Family: Calopterygidae

Genus: Neurobasis 

Species: Neurobasis chinensis (Linnaeus, 1758)
Common name: Stream glory

Habitat: Waterfalls, streams

Distribution: Chittagong, Sylhet

Abundance: Not very common

Flight season: June- November

Neurobasis chinensis is one of the most beautiful damselfly, found in the eastern waterfalls of Bangladesh. 

                                                              Male

The males are green in color, the fore wings are clear, the hind wings are opaque. Abdominal segments are green, anal appendages are black. 

The male shows an amazing view of the upper side of its lower wing. When the male fly over the waterfalls it's an astonishing scenario to enjoy. 

Female

The females are similar to male, green in color stay adjacent to male nearby waterfalls. The wings are more clear  than males, and different shaped anal appendages are good key to distinguish from male.  

I have sighted this matting pair from the Rechang waterfalls in my last visit to Khagrachori.

Neurobasis chinensis mate in bushes associated with the waterfalls. The female then oviposit in the stream water. 

My documented video on the matting behavior of N. chinensis  can be seen from the below link 

N. chinensis matting 

34. Aristocypha quadrimaculata (Selys, 1853)

Aristocypha quadrimaculata (Selys, 1853)

Number: 34

Family: Chlorocyphidae 

Genus: Aristocypha  

Species: Aristocypha quadrimaculata (Selys, 1853)
Common name: N/A

Habitat: Waterfalls, streams

Distribution: Chittagong

Abundance: Not very common

Flight season: June- November

Aristocypha quadrimaculata is one of the spectacular damselflies found in the waterfalls of the north east and south east region of Bangladesh.  

                                                         Male

The males are black in color. The head, abdominal segments, anal appendages and legs are black. Thorax black with yellow stripes. More than half of the apical parts of the wings are opaque with violet stripes in the hind wings. 

                                                               Female 

The females are black in color too. The head is black, thorax is black with yellow stripe. abdominal segments has yellow color laterally. Wings are transparent, pterostigma and legs are black.