We describe a new species of Liolaemus of the L. alticolor-bibronii group of the subgenus Liolaemus sensu stricto. Liolaemus bibronii has a large geographic distribution; however, preliminary studies suggest that it comprises a species complex. The new species is phenetically similar to L. bibronii and was confused with this taxon for many years. Nevertheless, the new species presents a combination of character states that clearly differentiate it. Also, the new taxon is distributed far from L. bibronii type locality (ca. 1,600 km). It differs from other species of Liolaemus in presenting a unique color pattern and a combination of morphological character states from lepidosis and morphometry. The new species inhabits pre-Andean localities in Uspallata, Las Heras department, northwest Mendoza Province, and is an insectivorous and oviparous species. With the description of this new taxon, the number of species of the L. alticolor-bibronii group rises to 30, but many populations still remain undescribed.