A survey of the semiaquatic bugs (Hemiptera: Heteroptera: Gerromorpha) from Alagoas and Sergipe, Northeast Brazil, is presented. Specimens have been obtained mainly during three expeditions carried out in 2018 and 2019. Individuals of 40 species, representing the following 18 genera and five families have been recorded: Brachymetra Mayr, 1865, Cylindrostethus Mayr, 1865, Limnogonus Stål, 1868, Neogerris Matsumura, 1913, Tachygerris Drake, 1957, Rheumatobates Bergroth, 1892, Halobatopsis Bianchi, 1896, Ovatametra Kenaga, 1942 (Gerridae); Lipogomphus Berg, 1879, Merragata White, 1877 (Hebridae); Hydrometra Latreille, 1797 (Hydrometridae); Mesovelia Mulsant & Rey, 1852 (Mesoveliidae); Husseyella Herring, 1955, Microvelia Westwood, 1834, Rhagovelia Mayr, 1865, Paravelia Breddin, 1898, Platyvelia Polhemus & Polhemus, 1993 and Stridulivelia Hungerford, 1929 (Veliidae). Alagoas and Sergipe have 35 and 31 new records, respectively. Rheumatobates trinitatis (China, 1943) and Rhagovelia plumbea Uhler, 1894 are recorded for the first time from Brazil.

We present a survey of the semiaquatic bugs (Insecta, Heteroptera, Gerromorpha) from Ribeira de Iguape river basin, Vale do Ribeira, São Paulo state, Brazil. Six species of Gerromorpha had been previously recorded from the area based on isolated collection events, namely Oiovelia brasiliensis Moreira, Nessimian & Rúdio, 2010, Rhagovelia accedens Drake, 1957, R. aiuruoca Moreira & Ribeiro, 2009, R. henryi Polhemus, 1997, R. lucida Gould, 1931, and R. trepida Bacon, 1948. Here, we record seven species for the first time from the region: Microvelia nelsoni Moreira, Barbosa & Ribeiro, 2012, M. venustatis Drake & Harris, 1933, R. occulcata Drake, 1959, R. plaumanni Polhemus, 1997, R. robusta Gould, 1931, R. zela Drake, 1959, and Stridulivelia ayacucho Polhemus & Spangler, 1995.

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