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The Neotropical diving beetle genus    Hydrodessus    J. Balfour-Browne, 1953 (  Coleoptera  :   Dytiscidae  :   Hydroporinae  :   Bidessini  ) is revised. Thirty species are recognized. The following new species are described:    H.   bimaculatus    sp. n.  (Venezuela),    H.   brevis    sp. n.  (Venezuela),    H.   concolorans    sp. n.  (Venezuela),    H.   continuus    sp. n.  (Venezuela),    H.   disjunctus    sp. n.  (Suriname),    H.   fasciatus    sp. n.  (Brazil),    H.   imparilis    sp. n.  (Ecuador),    H.   keithi    sp. n.  (Brazil, Colombia, Ecuador),    H.   kurti    sp. n.  (Suriname),    H.   kylei    sp. n.  (Suriname, Venezuela),    H.   laetus    sp. n.  (Venezuela),    H.   latotibialis    sp. n.  (Peru),    H.   maculatus    sp. n.  (Guyana, Venezuela),    H.   morsus    sp. n.  (Venezuela),    H.   palus    sp. n.  (Venezuela), and    H.   tenuatus    sp. n.  (Suriname). The following new synonyms are established:    H.   fragrans    Spangler, 1985 =    H.   biguttatus    (Guignot, 1957)  syn. n.  and    H.   robinae    Spangler, 1985 =    H.   octospilus    (Guignot, 1957),  syn. n.  One species is transferred from    Hydrodessus    to    Amarodytes    Régimbart,    A.   soekhnandanae    (Makhan, 1994),  comb. n.  Habitus photographs (dorsal and lateral) and photos of the ventral surfaces are provided for most species. Line drawings of male and female genitalia and other diagnostic features are also provided along with distribution maps.

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Revision of the Neotropical diving beetle genus    Hydrodessus    J. Balfour-Browne, 1953 (  Coleoptera  ,   Dytiscidae  ,   Hydroporinae  ,   Bidessini  )