What are the two native subspecies of the Western Blind Snake identified within the state of California?

The Southwestern Threadsnake (*R. h. humilis*) and the Desert Threadsnake (*R. h. cahuilae*)

California is noted as hosting at least two distinct native subspecies of *Rena humilis*. The first is identified as the Southwestern Threadsnake, designated by the scientific name *R. h. humilis*. The second native form present in the region is called the Desert Threadsnake, which is scientifically designated as *R. h. cahuilae*. It is particularly important for observers in California to be able to differentiate these native populations from the introduced Brahminy Blindsnake (*Indotyphlops braminus*). This differentiation relies on specific morphological criteria such as scale counts, the shape of the rostral scale, and the precise positioning of the dark eye spot relative to the ocular scale.