Oncocephalus simillimus Reuter, 1888c: 201. HT: male, Russia (FE), Khabarovka [= Khabarovsk]; MZHF (Jansson & Coscarón, 1989: 11).
Oncocephalus confusus Hsiao, 1977a: 76, 82 (junior primary homonym of Oncocephalus confusus Reuter, 1882d: 36; syn. Lee et al., 1994: 21). HT: male, China (NE), Heilongjiang; NKUM.
Oncocephalus colusus P.V. Putshkov in P.V. Putshkov et al., 1987: 104. New name for Oncocephalus confusus Hsiao, 1977a.
Oncocephalus hsiaoi Maldonado Capriles, 1990: 514. New name for Oncocephalus confusus Hsiao, 1977a.