Two new species of Notomicrus Sharp, 1882 from Brazil are described and illustrated: N. meizon sp. nov. from the state of Amazonas and N. teramnus sp. nov. from the state of Minas Gerais. The new species can be distinguished from all other members of Notomicrus mainly by their aedeagal features, especially for N. teramnus sp. nov., with a unique aedeagal structure. In addition, new records from Brazil are provided for N. brevicornis Sharp, 1882 (states of Amazonas and Pará), N. gracilipes Sharp, 1882 (Amazonas and Rio de Janeiro), N. malkini Young, 1978 (Amazonas, Pará and Rio de Janeiro), and N. traili Sharp, 1882 (Amazonas, Goiás and Paraná).

Two new species of Liocanthydrus Guignot, L. zanclus sp. nov. and L. mecespilus sp. nov., are described and illustrated from the Brazilian states of Goiás and Espírito Santo, Minas Gerais and Rio de Janeiro, respectively. New records from Brazil are also provided: Liocanthydrus clayae (J. Balfour-Browne) from the state of Pará, L. bicolor (J. Balfour-Browne) from the states of Amazonas and Pará and L. uniformis (Zimmermann) from the states of Espírito Santo, Maranhão and Pará. The previous key of Liocanthydrus is modified to include the new species.

A new species of Hydrocanthus Say, 1823 is described and illustrated, H. zimmermanni sp. nov. from Peru. A distinct pattern of prosternum and prosternal process setation and aedeagal features differentiate the new species from all other members of Hydrocanthus. Two new synonyms are established: H. rubiginosus Guignot, 1942 as junior synonym of H. debilis Sharp, 1882 (syn. nov.) and H. paludimonstrus Miller, 2001 as junior synonym of H. paraguayensis Zimmermann, 1928 (syn. nov.). In addition, a key to Brazilian species of Hydrocanthus is provided.

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AbstractFour new species of Canthysellus Baca & Toledo, 2015, C. kukrutkato sp. nov., C. putkarot sp. nov., C. omawe sp. nov. and C. yawari sp. nov., from the Brazilian states of Amazonas and Pará are described and illustrated. The new species can be recognized from all other members of the genus by their distinct aedeagal features; Canthysellus omawe sp. nov. and C. yawari sp. nov. differ furthermore from all other members of the genus by their distinct dorsal surface punctation and glabrous prosternal process. A geographic distribution map and a key to all known species of Canthysellus are provided. In addition, new records from Brazil are provided for C. buqueti (Laporte, 1835) from the states of Minas Gerais and Pará.