[3] The preferred natural habitat of X. bicolor is savanna, at altitudes of 900–1,400 m (3,000–4,600 ft).

White ventrally including the upper lip and the first two rows of dorsal scales on each side.

Frontal extremely large, more than half as long as the shielded part of the head.

One large elongate preocular, contacting the posterior nasal, the internasal, the frontal, and the third upper labial.

Six upper labials, the first very small, third and fourth entering the eye, the fifth very large and contacting the parietal.

[3] X. bicolor is terrestrial and fossorial, burrowing in aeolian and alluvial sands.