Four new species of Desmopachria from the Amazon river floodplain (várzea) are described and illustrated, D. manus sp. nov., D. varzeana sp. nov., D. cavia sp. nov. and D. nigrocapitata sp. nov., together with new distributional records of D. balionata Miller, D. draco Miller, D. subnotata Sharp and D. striola Zimmermann for Amazonas and Pará states in Brazil.

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Eight new species of DesmopachriaBabington, 1841 are described and illustrated from Brazil: D. dicrophallica sp. nov. , D. disticta sp. nov. , D. grammosticta sp. nov. , D . grandinigra sp. nov. , D. itamontensis sp. nov. , D. leptophallica sp. nov. , D. stethothrix sp. nov. , and D. ukuki sp. nov. The species D. amyaeMiller, 2001 , D. cheiMiller, 1999 , D. margarita Young, 1990, and D. volatidiscaMiller, 2001 are recorded for the first time from Brazil. From species of the Desmopachria reported in Brazil, D. aldessaYoung, 1980 has a new record from Pará state and D. fossulataZimmermann, 1928, D. granoidesYoung, 1986 , and D. laevis Sharp, 1882 have new records from Rio de Janeiro State. A checklist of all Desmopachria recorded from Brazil is presented with notes about some of the localities. Resumo Oito espécies novas de DesmopachriaBabington, 1841 são descritas e ilustradas para o Brasil, D. dicrophallica sp. nov. , D. disticta sp. nov. , D. grammosticta sp. nov. , D . grandinigra sp. nov., D. itamontensis sp. nov., D. leptophallica sp. nov., D. stethothrix sp. nov. e D. ukuki sp. nov. As espécies D. amyaeMiller, 2001, D. cheiMiller, 1999 , D. margarita Young, 1990 e D. volatidiscaMiller, 2001 são registradas pela primeira vez para o Brasil. Das espécies de Desmopachria registradas para o Brasil D. aldessaYoung, 1980 tem um novo registro para o estado do Pará e D. fossulataZimmermann, 1928 , D. granoidesYoung, 1986 e D. laevis Sharp, 1882 têm novos registros para o estado do Rio de Janeiro. Uma listagem de todos os Desmopachria registrados para o Brasil é apresentada, com notas acerca de algumas localidades.

Three new species of Bidessodes (Coleoptera, Dytiscidae) are described and illustrated from the Amazon river floodplain (“várzea”): B. nessimiani sp. nov., B. hamadae sp. nov., and B. demarcoi sp. nov. Bidessodes evanidus Young is recorded for the first time from Amazonas and Pará states, Brazil. All species are included in the subgenus Bidessodes s. str. An identification key of Bidessodes s. str. species, modified from Young (1986), is provided.