Hypsiglena jani, commonly known as the Texas night snake, is a small, nocturnal colubrid found in arid and semi-arid regions of Texas and northern Mexico. It has a slender body, brown blotches on a lighter background, and elliptical pupils. The snake feeds primarily on lizards and small mammals.

Hypsiglena jani, commonly known as the Texas night snake, is predominantly found in the southwestern United States and northern Mexico. Its geographical distribution includes parts of Texas, New Mexico, Arizona, and extends into regions of northern Mexico such as Chihuahua and Coahuila.

The Texas night snake typically inhabits arid and semi-arid regions characterized by desert scrub, rocky hillsides, and grasslands. The climate in these areas is generally dry, with hot summers and mild winters. The species is often found in environments with loose soil, which facilitates burrowing.

Hypsiglena jani is a nocturnal species, often active during the cooler parts of the night. It plays a role in controlling insect and small vertebrate populations, feeding primarily on lizards, small snakes, and amphibians. This snake is well adapted to its arid environment, relying on its cryptic coloration to blend into the rocky and sandy terrain.