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We studied richness and distribution of amphibians and non-avian sauropsids from the 2 arid ecoregions of Hidalgo. A taxonomic list with bibliographical and field information was used, complementarity among ecoregions was analyzed and the composition of species against 5 arid regions of Mexico was compared. In addition, we discussed natural history attributes of species, their conservation status, and endemism. We report 82 species (20 amphibian and 62 non-avian sauropsids). The eco-region Central Mexican Shrub showed the greatest richness (65 species; 29 unique and 36 shared with the Central Plateau Shrub eco-region). We found 62 species distributed only in xeric shrub, 2 in deciduous tropical forest and 18 in both types of vegetation. The complementarity between ecoregions was 55 for amphibians and 32.07 for non-avian sauropsids. The greater similarity (52.4) was found with the arid zone of Queretaro. Most species are terrestrial, insectivores, and oviparous. There were more nocturnal amphibians and more diurnal non-avian sauropsids registered. Finally, 18 species are under special protection, 16 threatened and 44 are endemic to Mexico. All Rights Reserved (C) 2015 Universidad Nacional Autonoma de Mexico, Instituto de Biologia.