Oncocephalus means bulging head, head like a tumor or swollen head. In Entomology is also the castellanization of the name of a genus of insects hemipteros : Oncocephalus . They belong to the family Reduviidae and are known as killer insects, killer bed bugs, vinchucas, apothecaries. It is also another way to call the batfish or bat pejesapo (Ogcocephalus vespertilio) of the family Ogcocephalidae .
