Ranatra fusca is a

water stick-insect ''Ranatra'' is a genus of slender predatory insects of the family Nepidae, known as water scorpions or water stick-insects. There are around 100 ''Ranatra'' species found in freshwater habitats around the world, both in warm and temperate regions ...

in the family Nepidae, native to North America. It is known by the common name brown water scorpion.Abstract
/ref> It is generally long. They are carnivorous and feed on other insects and crustaceans. They are most common from spring to autumn.

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External links

Photo on flickr
Insects described in 1820 Nepidae Hemiptera of North America {{Nepomorpha-stub