The information about mygalomorph spiders (Dipluridae y Theraphosidae) of Estado de Mexico is presented, new locations are cited, three species are cited for the first time, four new species of the Theraphosidae family are described, and data on the genus Davus O.
Pickard-Cambridge, 1892 are provided as well as most significance taxonomic characteristics are illustrated.
A new species of the genus Citharacanthus Pocock, 1901 from Chiapas, Mexico is described and distinguishes from the congeners by the shape of spermathecae.
A new species of the genus Bonnetina Vol, 2000, based on differences bulb palpate male is described spermathecae female, number of teeth and the ratio quelíceros the legs in the male. Further proposed taxonomic guide for the four known species of far.