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Recent collecting efforts in the Neotropics have led to the discovery of numerous new species and lineages of aquatic beetles. Here, three new genera are described to accommodate fifteen new species of water scavenger beetles of the subfamily   Acidocerinae   from northern South America:    Crucisternum    gen. n.  for    C.   escalera    sp. n.  (Venezuela),    C.   ouboteri    sp. n.  (Guyana, French Guiana, Suriname, Venezuela),    C.   queneyi    sp. n.  (French Guiana),    C.   sinuatus    sp. n.  (Brazil),    C.   toboganensis    sp. n.  (Venezuela),    C.   vanessae    sp. n.  (Suriname), and    C.   xingu    sp. n.  (Brazil);    Katasophistes    gen. n . for    K.   charynae    sp. n.  (Peru),    K.   cuzco    sp. n.  (Peru),    K.   merida    sp. n.  (Venezuela) and    K.   superficialis    sp. n.  (Ecuador); and    Nanosaphes    gen. n.  for    N.   castaneus    sp. n.  (Brazil),    N.   hesperus    sp. n.  (Suriname),    N.   punctatus    sp. n.  (Guyana), and    N.   tricolor    sp. n.  (Guyana, Suriname). It was also found that the monotypic Neotropical endemic genus    Dieroxenus    Spangler, 1979,  syn. n.  is congeneric with    Chasmogenus    Sharp, 1882 resulting in the single new combination    Chasmogenus   cremnobates    (Spangler, 1979),  comb. n. .    Katasophistes   merida    sp. n.  is known exclusively from seepage habitats, while the remaining taxa described herein are primarily associated with the margins of densely forested streams. Diagnoses, illustrations, distribution maps, and habitat summaries are provided for all new genera and species. A key to the genera of   Acidocerinae   of the New World is provided.

Three new genera of acidocerine water scavenger beetles from tropical South America ( Coleoptera , Hydrophilidae , Acidocerinae )