Oliarus vanstallei nom.nov.
= Oliarus muiri Van Stalle, 1991a: 38 (from Indonesia) primary homonym of Oliarus muiri Giffard, 1925: 66 (from Hawaii)
Etymology: The species is named in honor of Jan Van Stalle, an entomologist who specialized in Auchenorrhyncha, Royal Belgian Institute of Natural Science, Belgium.
Oliarus opalinulus nom.nov.
Oliarus opalinus Fennah, 1945a: 421 (from Venezuela) primary homonym of Oliarus roridus var. opalinus Fieber, 1876a: 202 (synonym of Pentastira major Kirschbaum, 1868b: 44; from Europe)
Etymology: The name is derived from Oliarus opalinus Fennah, 1945, from English opaline + -ulus, a diminutive suffix. Treated as a noun in apposition.
Notes: The junior homonym could not be preserved under ICZN article 23.9 since the senior homonym was widely used as a valid subspecies name after 1899 and the junior homonym was not used as valid in 25 works, published by at least 10 authors.
Oliparisca spectabilis nom.nov.
= Oliparisca inermis (Van Stalle, 1991a: 76) (original genus Oliarus; from Indonesia) primary homonym of Pentastiridius inermis (Fennah, 1957) (original genus Oliarus; from Democratic Republic of the Congo)
Etymology: from Latin adjective spectabilis, noteworthy, outstanding
Pentastiridius (Haliarus) signatus (Fieber, 1876) reinstated, comb.nov.
= Pentastiridius (Haliarus) obscurus (Signoret, 1865a: 127) (from Europe) primary homonym of Cixius obscurus Walker, 1851a: 347 (synonym of Achaemenes australis (Walker, 1851a: 345); from Natal)
Notes: The primary homonym Reptalus obscurus (Signoret) is replaced with a substitute name, a junior synonym Pentastiridius (Haliarus) signatus (Fieber, 1876).