Rhomborrhina sp.(Dark Blue Color from TIBET)

[timoinsects]

here's a photo of a Rhomborrhina sp.? from S.E.Tibet,2100-2250m between.it should be a rare sp. there,2011 had one,2013 or 2014 had one, 2016 had one, 3 times caputure.two times were found on the ground of trail,this time found when it was flying around a big tree trunk so i use net getting it down.
don't know what sp. is it,does anyone know what sp. is it?
Thanks!
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[timoinsects]

underneath view.