It is endemic to north-central coastal Venezuela and only known from its type locality, San Esteban in the state of Carabobo.

[2] The specific name williamsoni honors E. B. Williamson, the person who collected the holotype.

[2] Williamson, an entomologist, was part of "the University of Michigan-Williamson expedition to Venezuela" that took place in 1920.

the sides are light with dark vertical bars, slightly tilted forward.

The throat is yellowish white while the belly and inner surfaces of the limbs are grayish yellow.