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Pterotosoma castanea
Thanks Daniele. That one appears to be correct the ID. Will go with it.
As the pinned specimen in the Wikipedia reference is in poor condition and not in a natural posture, here are some other images:
http://dearlep.tw/species.html?namecode=...
http://taibif.tw/zh/namecode/348073
I hope someone can confirm the suggestion. Although it is listed from the East Himalayan region there's a lack of photographic documentation.