Monday evening, after another cloudy day, I had returned home and checking it in the evening noticed the peculiar secondary genitalia. Of course it now also dawned on me that the thorax markings were not right after all. I opened up the volume on Thailand by Asahina and with a strike of good fortune opened it as Hylaeothemis clementia. There it was!
A rarely recorded, but possibly overlooked, dragonfly, H. clementia to my knowledge has been recorded once in Vietnam, in Son La Province in 2003 (Sasamoto & Do, in Do & Dang, 2007). Son La is adjacent to Yen Bai Province, and the sight where is was recorded is about 100km away from my site, as the crow flies.
I found my specimen along a small stream with a few puddles in heavily grazed and degraded woodland on a hill side. As it was freshly emerged, this must be within its habitat range.
|Fresh male of Hylaeothemis clementia, easily overlooked!|
|But both the central dorsal line and the lines over the humeral suture are different from T. platyptera.|
|The facial pattern is reminiscent of T. platyptera, which similarly has anteclypeus, postclypeus and antefrons yellow.|
|The hamulus is a clear give-away though, very different|