
Ilybius is a large genus of predatory aquatic beetles in the family Dytiscidae. The genus is native to the Palearctic (including Europe), the Near East, the Nearctic, and North Africa. 70 species has been described from this genus: ...
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http://en.wikipedia.org/wiki/Ilybius

Ilybius is a genus of predacious diving beetles of the family Dytiscidae with seven species occurring in Britain. They range from nine to fourteen millimetres in length.
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http://www.probertencyclopaedia.com/browse/BI.HTM
No exact match found.