The stilt bug genus Metajalysus Štusák is revised and three new species are recognized. A neotype of the type species, M. horvathi Štusák, is designated and the new species M. clavatus, n. sp. from Argentina, M. graziae, n. sp. from Argentina and Bolivia, and M. pilosus, n. sp. from Ecuador are described. Digital images of the adult male and female and male genitalia are provided and a key to the species of the genus is given.
Keywords: Hemiptera, Insecta, New World, true bugs, distribution, hosts, identification key.