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This is a thumb sized beetle, which has a cylindrical body.
Usually seen in lower altitudes.
This one was strangely spotted at an altitude about 10,000 ft. It's perhaps been brought here blown by the wind from a lower altitude.
A holarctic genus, in which most species are spotted, or striped, in white.
In the Himalaya, I guess, will be the southern border of the genus' range, and the altitude where you found it is probably fine for the species.