Cloud forests of the montane region of Mesoamerica have high levels of endemism and are important for biodiversity conservation. Prioritization of conservation areas is possible using biogeographic and phylogenetic information. The phylogeography of the flightless and endemic bess beetles Ogyges and Petrejoides (Coleoptera: Passalidae) will be used to prioritize conservation areas and identify unique genetic reservoirs in the southern Guatemalan montane region (Ogyges) and Mesoamerica (Petrejoides). I will evaluate the systematics and biogeography of P. orizabe species group. This research will be useful in clarifying the ongoing debate concerning the classification of Petrejoides, prioritizing conservation areas in Mesoamerica, identifying unique genetic reservoirs, and contributing to the knowledge in the natural history of the area.