In Mexico there are twelve species of genus Dendroctonus, which are distributed in coniferous forests, mainly Pinus. Most of the species show a wide geographical distribution. By means of species isorichness maps of genus Dendroctonus, as well as by biogeographic indexes of resistance and anisotropy, the barriers and zones which favor the geographic distribution of the genus, and particularly of the primary species, were determined. The isorichness maps show that the Sierra Madre Occidental is the richest species- and diversity-wide mountainous system. The lowest level of environmental resistance for the genus (R=0.73) is present in zones isolated from the Sierra Madre Occidental, Sierra Madre Oriental, Sierra Madre del Sur, as well as in a wide region of the Trans-Mexican Volcanic belt. The lowest level of environmental resistance for primary species (R=0.58) is located at isolated points in the Mexican mountainous systems, except in the Sierras of Baja California. The results indicate that the areas with less resistance for the genus as well as for primary species are small in comparison with the potential geographic area that these insects could have. The areas with less resistance are isolated due to the lack of pine forests and to topographic characteristics. The most evident corridor for the genus in Mexico is located in the Trans-Mexican Volcanic belt.