70 spp. are recorded, of which 69 arc cited for the first lime for Hidalgo State. The study was conducted in an altitudinal gradient of 740-2050 m a si. comprising 17 localities. Archilestes regalis, Argia calida, A. rhoadsi, A. medullaris, Argia new spp. and Oplonaeschna armata are discussed in greater detail.