Around the fish ponds in Cat Tien I noticed another Brachydiplax, stubbier and less brightly pruinose than B. farinosa and less yellow on the thorax than B. chalybea. It also missed the amber wing patches of that species. It soon became clear this was B. sobrina, a species known from India to Thailand. It had not been recorded in Vietnam to my knowledge, but was very common in Cat Tien.
I am sorry that the photos from this period are rather bad. One camera gave up completely in the constant rain and the other clouded over, as did the lenses.
|A male Brachydiplax chalybea chalybea, with extensive yellow thorax|
|Here in hand, with deep yellow thorax and S1-3, plus amber bases to the wings|
|Brachydiplax sobrina, with green thorax and a tiny whitish spot on the anal triangle of the hindwing.|
|Dorsal view of B. sobrina, male|
|Male B. sobrina, showing the 7 cross veins in the front wing|
|Female B. sobrina|
|Yet another male B. sobrina|
|For comparison, a male B. farinosa under rainy and foggy conditions|