Appearance
:''See snake scales for terms used''''B. trigonata'' has anterior palatine and mandibular teeth scarcely larger than the posterior. Its eyes are as long as the distance from its nostril; the rostral is broader than deep with the internasal scales shorter than the prefrontal scales. The frontal scales are longer than their distance from the end of the snout and shorter than the parietal scales. The loreals are as long as they are deep, or, they can be deeper than they are long. ''B. trigonatas one preocular does not extend to the upper surface of the head. The species has two postoculars, temporals 2+3, and 8 upper labials, with the third, fourth, and fifth entering the eye. They can have 4 or 5 lower labials in contact with the anterior chin-shields, which are about as long as the posterior. ''B. trigonatas body is moderately laterally compressed with smooth dorsal scales in 21 rows, with apical pits, disposed obliquely, with the vertebrals very feebly enlarged. There are 229-269 ventral scales, 79-92 divided subcaudal scales, and a single anal scale.
''B. trigonata'' has a yellowish-olive or pale grey colour along the back and a white black-edged zigzag band along the length of the head with two brown bands edged with black, diverging posteriorly. The belly is white and can have a series of small brown spots along each side.
The total length is around 3 feet with a 7 inch tail.
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