According to specimen’s labels and the Generalkatalog, these two callitrichids were collected by Sellow. The Saguinus niger (ZMB _MAM 289, skin only) has “ Pará ” as the locality (Fig. 7 d). The Mico argentatus (ZMB _MAM 284, skin only) label reads “Brasilien” (Fig. 7 c). These two taxa are restricted to the Amazonia of the Brazilian state of Pará (Rylands and Mittermeier 2013) and more likely were collected by Sieber, who acquired specimens in that region for Hoffmannsegg (Ávila-Pires 1967). Ávila-Pires (1967) reported on a similar discrepancy for specimens of the bristle-spined rat, Chaetomys subspinosus (e.g., ZMB _MAM 1300), an animal restricted to the Atlantic Forest of Rio de Janeiro, Minas Gerais, Espírito Santo, Bahia, and Sergipe, but whose specimen labels and catalogue entries read “ Cametá,” a locality in the Amazonia of Pará, northern Brazil, where Sieber made collections.