Friday, July 3, 2015

38. Trithemis festiva (Rambur, 1842)

Trithemis festiva (Rambur, 1842)  

Trithemis festiva (Rambur, 1842) 


Number: 38
Family: Libellulidae
Genus: Trithemis  
Species: Trithemis festiva (Rambur, 1842) 
Common name: Black Marsh glider
Habitat: Streams, waterfalls
Distribution: Chittagong, Sylhet 
Abundance: Common 
Flight season: March - August

Trithemis festiva one of the four trithemis species found in Bangladesh. The species I have sighted from Chittagong and Sylhet. Commonly, the species is observed nearby streams, waterfalls and stream associated forest patches. The species is distinguished from other species by its black color, bluish abdomen and yellow markings in the abdominal segments. 


The male has blue thorax, legs are black, wings are transperant, yellow patches present in the wing base. 

I have observed the male from Khagrachari near richag water falls. The male was perching in the reeds of the streams.  

As the male gets older, it become more black. The thorax turns black from blue. Also, the abdominal yellow markings abolished.