 Triatoma yellowpensis sp. November is a new species of bug found on the pacific coast of Jalisco, Mexico. It differs from other species of triatoma in its head length, proportions of labial segments, coloration patterns, positioning of spiracles, and male genitalia. A geometric morphometric analysis was conducted to compare the differences between T, yellowpensis sp. November, T. Demidiata, T. Gerstiacary, and T. Recurva. Additionally, an updated key for all triatoma species found in Mexico was provided. This article was authored by one telus rendon, Lida Esteban, Laura Rengifo-Korea, and others.