As stated previously, the juvenile Senticolis triaspis has some wildly different markings than the adult.  I doubt this individual is really an adult, since it was just under 50 cm in length, but it has lost its juvenile markings.  Real adults probably look more like this.

These snakes are ill-tempered, and very aggressive.  While making the catch, it lunged and struck several times at me; consequently, getting a nice photograph of it curled up proved difficult.  This is the best I got…