Abstract
The author provides a survey of the Hydradephaga (51 species) of Elba Island (Tyrrhenian sea, Tuscany, Italy) based on literature and on personal research. The total number of species collected by the author during 1998-2006 is 39 (1,468 specimens: 1,272/196 adults/larvae). Fifteen species are new for the island: <em>Haliplus guttatus</em> (Haliplidae), <em>Liopterus haemorrhoidalis</em>, <em>Hygrotus impressopunctatus</em>, <em>Hydroporus jonicus jonicus</em>, <em>H. memnonius, H. discretus</em>, <em>Graptodytes bilineatus, G. granularis, Agabus guttatus guttatus, Ilybius pederzanii, Melanodytes pustulatus, Rhantus suturalis, Hydaticus leander, H. seminiger</em> and <em>Stictotarsus procerus</em> (Dytiscidae). This last species is also new for Tuscany. <em>Agabus</em> (“<em>Metronectes</em>”) <em>aubei</em>, a Tyrrhenian (Corsica and Elba) species, is recorded for the first time since 1963. For each species faunistic and zoogeographic data are provided and possible conservation aspects are discussed
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