The phoretic interaction between Americhernes oblongus (Say) (Chernetidae) and Mallodon chevrolatti (Thomson) (Cerambycidae) is documented for the first time. Furthermore, with this record, the distribution of A. oblongus to western Panama is expanded. This study contributes to our knowledge of the pseudoscorpion fauna in the central part of America, particularly shedding light on phoretic interactions. Americhernes oblongus is now documented for the first time in West Panama, expanding the known distribution within the country. The discovery includes a female specimen found attached to a male Mallodon chevrolatii. This finding not only marks the initial occurrence of A. oblongus on the western side of the isthmus but also represents the first report of a phoretic interaction between these organisms. This study contributes to our knowledge of the pseudoscorpion fauna in the central part of America, particularly shedding light on phoretic interactions.