The new stilt bug genus Bajacanthus, n. gen., and new species B. immaculatus, n. sp. are described from the Vizcaino Peninsula in Baja California Sur, Mexico. The berytid was discovered on the recently described endemic plant, Bajacalia moranii B. L. Turner (Asteraceae). A diagnosis, description, digital images of the adult male and female, the male genitalia capsule, and parameres are provided to facilitate recognition. A discussion of relationships is given and a revised key to the genera of the tribe Hoplinini (Gampsocorinae) is provided.