Callicebus.nl: the name Pithecia melanops was given to a titi monkey by Vigors in 1929, but unfortunately I have not obtained the original publication yet. It was mentioned several times as a synonym.
Gray, 1870
Callithrix personatus
Synonyms: Callithrix personatus (Geoffroy, 1812); Pithecia melanops (Vigors, 1829); C. brunnea (Natterer, Wagner, 1842).
Trouessart, 1898-1899
Callithrix personata
Synonyms: personata (Geoffroy, 1812; Spix, 1823; Wied, 1826; Gray, 1970); melanops (Vigors, 1829); p. fossilis (Winge, 1895); p. grandis (Jacchus) (Lund, 1842; Winge, 1895); chlorocnemis (Lund, 1842; Winge, 1895); antiqua (Lund, 1842).
Elliot, 1913
Callicebus personatus
Synonyms: Callithrix personatus (Geoffroy, 1812; Kuhl, 1820; Desmarest, 1820; Spix 1823; Wagner, 1840, 1855; Tschudi, 1844, I. Geoffroy, 1851; Wallace, 1852; Dahlbom, 1856; Reichenbach, 1862; Mivart, 1865; Gray, 1870; Schlegel, 1876); Simia personatus (Humboldt, 1811); Pithecia melanops (Vigors, 1829); Cebus personatus (Blainville, 1841; Lesson, 1842); Saguinus personatus (Lesson, 1840).
Cabrera, 1958
Callicebus personatus personatus
Synonyms: Simia personata (Humboldt, 1812); Callithrix personatus (Geoffroy, 1812); Saguinus personatus (Lesson, 1840); Pithecia melanops (Vigors, 1828); Cebus personatus (Fischer, 1829); Callicebus personatus (Elliot, 1913).
Hershkovitz, 1990
Callicebus personatus nigrifrons
Synonyms: Callithrix nigrifrons (Spix, 1823 - plate) ; Pithecia melanops (Vigors, 1829, Gray, 1870); Callithryx [sic] chloroenemis (Lund, 1840 – nomen nudum); Callithrix chloroenemis [sic] (Lund, 1842 - nomen nudum); Callithrix crinicaudus (Lund, 1841); Jacchus grandis (Lund, 1841);
Callicebus personatus brunello (Thomas, 1913).
Groves, 2001
Callicebus personatus nigrifrons
Synonyms: Callithrix nigrifrons (Spix, 1823); Pithecia melanops (Vigors, 1829); Callithryx chlorocnemius (Lund, 1840); Callithrix crinicaudatus (Lund, 1841); Jacchus grandis (Lund, 1841); Callicebus personatus brunello (Thomas, 1913).
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