Karl Shuker writes in Strange magazine that in 1994 two new species of monkey were discovered in the Brazilian Amazonia by Drs. Stephen Ferrari and Helder Queiroz. The new monkeys - the black-headed marmoset (Callithrix nigriceps and the Ka'apor capuchin (Cebus kaapori) - are the third and fourth new species, respectively, of monkey discovered in the 1990's. The first and second were the caissara lion tamarin and the Maues marmoset. Lets hope more are uncovered.
(C) Ben S. Roesch
Source: Karl Shuker, writing in Strange Magazine #15.