A new species of Trichobius Gervais, 1844 (Diptera: Streblidae) is described from specimens in Jalisco, Mexico, from host bat Choeronycteris mexicana Tschudi. We consider the new species described is related to the "dugesii" group, since it shares certain characteristics those of T. angulatus and T. tiptoni, but it results easy to differentiate from all the known species due to the cheatotaxis of the thorax in which the prescutum setae, and the lateral setae are very long, while the discal setae are abruptly smaller and denser. It also presents the metasternal lobe, which is very broad and translucent.