Sonora semiannulata, commonly known as the Ground Snake, is a small, slender snake found in the southwestern United States and northern Mexico. It thrives in deserts and arid regions, often hiding under rocks or burrowing in sandy soils. Its coloration varies widely, from gray to reddish-brown, often with distinct banding patterns.

The Sonora semiannulata, commonly known as the ground snake, is native to the southwestern United States and northern Mexico. Its geographical distribution includes states such as Arizona, New Mexico, Colorado, Utah, Nevada, Texas, and extends into parts of Mexico, including Chihuahua and Sonora.

This species typically inhabits arid and semi-arid regions characterized by deserts and scrublands. The environmental conditions are often hot and dry, with sparse vegetation consisting of desert shrubs and grasses. The ground snake is also found in rocky areas, sandy soils, and sometimes in grasslands, often favoring habitats that provide ample cover and access to insects and small invertebrates for food.

The Sonora semiannulata occupies an ecological niche as a small, nocturnal predator. It plays a role in controlling insect populations and is adapted to life in harsh, dry environments. Its coloration and small size provide camouflage against predators, and it has adapted to survive with limited water resources.