Scientific Name: Orchithemis pruinans
Common Name: Blue Sentinel
O. Pruinans is a rare species of dragonfly and is known from a few localized site at the Central Catchment Nature Reserve. Males are often seen at their favorite sites near to slow flowing streams or forest pools in the nature reserve. Females have so far not been recorded in Singapore yet, but the recent photo of a copula which I have taken could well be one of the few rare shots of the female species ever recorded here.
Male typically has a black thorax and abdomen. The wings are narrow and the abdomen is thinner and longer than the similar looking O. pulcherrima. The powdery bluish-white at the 2nd to halfway along the 4th segment of the abdomen is a prominent marking of this species. Eyes are reddish on top and green below.