Saguinus nigricollis (Spix, 1823) . Sim. Vespert. Brasil., p. 28.

TYPE LOCALITY: Brazil, Amazonas, Säo Paulo de Olivença .

DISTRIBUTION: W Brazil, E Peru, E Ecuador.

STATUS: CITES - Appendix II.

SYNONYMS: graellsi, rufoniger .

COMMENTS: Includes graellsi; see Hershkovitz (1977:628).