Appearance''B. supraciliaris'' is usually 50–60 cm in total length , but can reach 80 cm . Its body colour varies. It can be either bluish-green, reddish-brown, or reddish-maroon, but usually it is bright-green or moss-green. The body is circular, ovoid and rhomboid in cross-section, with irregular dorsal blotches, that sometimes form crossbands. The belly is light. There are 21-23 dorsal scales rows at midbody. The head carries dark stripes and prominent scales that are located above the eyes. The only sexual dimorphism noted is that females of the species tend to be longer and thicker than males.
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