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A terrestrial species, adults usually grow to a total length 75–125 cm (about 30-50 inches) and are moderately heavy-bodied. Reports of the maximum size are not clear, as this species is often confused with B. asper. Soini (1974) mentioned of a series of 80 specimens collected in northeastern Peru, the largest was a female of 138.8 cm (4.55 ft). The largest specimen measured by Campbell and Lamar (2004) was a female with a total length of 162 cm (5.31 ft). The scalation includes 23-29 (usually 23-25) rows of dorsal scales at midbody, 169-214 and 177-214 ventral scales in males and females, respectively, 52-86 (usually 75 or fewer) subcaudal scales in males, which are usually divided, and 47-72 subcaudals in females. On the head, the rostral scale is about as high, or slightly higher, than it is wide. There are three to 11 (usually five to 9) keeled intersupraocular scales, seven to 13 (usually eight to 11) sublabial scales and six to 9 (usually seven) supralabial scales, the second of which is fused with the prelacunal to form a lacunolabial.
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