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Thirty-four species of Triatominae (Hemiptera, Reduviidae) are recorded in Mexico, <i>Triatoma</i> Laporte, 1832 the most speciose genus in this country. Here, we describe <i>Triatoma yelapensis</i> sp. nov. from the Pacific coast of Jalisco (Mexico). The most similar species to <i>T. yelapensis</i> sp. nov. is <i>T. recurva</i> (Stål, 1868), but they differ in head longitude, the proportion of labial segments, coloration pattern of corium and connexivum, spiracles location, and male genitalia. To provide statistical support for the morphological distinctiveness of the new species, we performed a geometric morphometric analysis of <i>T. yelapensis</i> sp. nov., <i>T. dimidiata s.s.</i> (Latreille, 1811), <i>T. gerstaeckeri</i> (Stål, 1859), and <i>T. recurva</i> (Stål, 1868), considering head morphology. We also provide an updated key of the genus <i>Triatoma</i> for species recorded in Mexico.