Holbrookia subcaudalis is found in Southern Texas and Northern Mexico.
They occur in dry subhumid flatlands and low hills with dark loamy clay soil and sparse vegetation such as mesquite trees and small patches of grass. They are diurnal running away quickly from a threatening situation. They are insectivorous and reproduction is oviparous.
Holbrookia subcaudalis grows no more than 4.5 to 6 inches, tail length included. They have a slightly flattened body. Their base coloration is tan to gray with round bold spots on the dorsum. A thick pale line runs through the center of its back down to its tail from its neck. Its limbs are slender and have the spots on them. Its underbelly is whitish to pale. Its eyes are centrally located on the head with no visible ear opening. During breeding, the females turn light green on the back and neck.
Learn more with Schechter Natural History's Guide to Reptiles and Amphibians