1) Boat bug 1) Hemipteran 2) Hemipterous insect 3) Notonecta undulata 
Most of the West End of London`s commercial theatres are in the City of Westminster (a London borough) centred on Covent Garden and Shaftesbury Avenue. ...
[n] - predaceous aquatic insect that swims on its back and may inflict painful bites
Notonecta undulata noun predaceous aquatic insect that swims on its back and may inflict painful bites
Aquatic predatory bug living mostly in fresh water. The adults are about 15 mm/0.5 in long and rest upside down at the water surface to breathe. When disturbed they dive, carrying with them a supply of air trapped under the wings. They have piercing beaks, used in feeding on tadpoles and small fish. Classification Backswimmers belong to the gen...