Dytiscus

Dytiscus is a genus of large (36 to 44 mm in length) predacious diving beetles of the family Dytiscidae represented by six species in Britain. They are dark brown, often with an olive-green reflection, and have a yellow marginal stripe. On the first pair of tarsi the male have one large, one smaller and a number of smaller still suction discs. Both
Found on http://www.probertencyclopaedia.com/browse/BD.HTM

Dytiscus

Dytiscus (great diver) (based on Greek δυτικός, `able to dive`) is a Holarctic genus of predaceous diving beetles that usually live in wetlands and ponds. There are 26 species in this genus distributed in Europe, Asia, North Africa and North and Central America. They are predators that can reduce mosquito larvae. Dytiscus species are larg..
Found on http://en.wikipedia.org/wiki/Dytiscus
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