I agree that this is a male mosquito, but I am not sure that it is Ochlerotatus hendersoni. This species usually has lighter scales on the sides of the thorax (see links), and can even be confused with triseriatus. Also, I'm not familiar with mosquito species in Thailand, but I'm not sure that hendersoni occurs there. This looks more like either a male Armigeres or else some other Aedes/Ochlerotatus species.
http://bugguide.net/node/view/81412
http://bugguide.net/node/view/61384/bgimage
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