Bothrops insularis, known as the 'golden lancehead' is a venomous pitviper species found only on Ilha da Queimada Grande, off the coast of So Paulo state, in Brazil. The species is named for the light yellowish brown color of its underside and for its head shape which is unique to the genus Bothrops. No subspecies of Bothrops insularis are currently recognized. B. insularis grows to an average length of 70cm, although its maximum length is known to reach at least 118cm. The color pattern consists of a pale yellowish brown ground color, overlaid with a series of dorsal blotches that may be triangular or quadrangular, broad or narrow, and alternating or opposite along the dorsal median. In captivity, this yellowish color often becomes darker, which may be the result of poor circulation caused by ineffective thermoregulation. A banded pattern results when the pattern is opposite. The head lacks a well-defined post-orbital stripe. The belly is a uniform pale yellow or cream.