The genus Beronium encompasses only three species, one described from Morocco, one from the Canary Islands and another from the south-east of the Iberian Peninsula. Each of these species was reported from a single location, their type localities. Captures in six new locations, all caves, are reported for one of the species, Beronium laemostenis Mayoral and Barranco 2005, previously considered endemic to a single cave in the south of Spain. Of the fifty larvae studied, a single teratological case in the second dorsal sclerite is reported and illustrated. Comments on the morphology, host specificity and distribution in caves for the genus Beronium are provided.