This sps is also known from S-Yunnan (pictured in Weigel, Meng & Lin 2013: p. 192, fig. i, as Monochamus (?) spec. - this female corresponds with a male spm collected in the Sapa area in N-Vietnam very well.
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Good idea Francesco, Trachystohamus should be the most related genus !
I'd try to add these details to the manuscript, of which we have already received the proofs since two months and which will be published soon in Lambillionea.
P.s. Ich habe keine Dateien deines Exemplars, Andreas...