I have several from Borneo, all three have some markings on the elytra. One (1) has markings like this, one (#2) has smaller markings and one (#3) has almost none!
The holotype has markings in between my #2 and #3.
M. biplagiatus was originally described from India. Wallin et al (2014) record it from Cameron Highlands, yet they provide only images of genitalia.
One must consider the possibility that biplagiatus is a synonym.