Olenecamptus bilobus (Fab. 1801). There are many subspecies, of which it is difficult to say which ones are in Borneo. There is O. bilobus borneensis Pic, 1916.
O. bilobus borneensis Pic, 1916 is like this for Breuning (1940) : 17.71 KB but I agree, It should be O. bilobus. I do not understand why subspecies are valid for a such widespread species. Only variations I think.