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Hi,
after this post,
https://diptera.info/forum/viewthread.php?thread_id=95377
I found this insect again at the same place.
I think that it is Stomorhina.
Didier


North-East of Thailand
41130 Ban Phon Ngam
17.3633228, 102.9776517
date : 28/05/2020
size : about 2-3 mm