''Eretes sticticus'', the western erete, is a species of

predaceous diving beetle The Dytiscidae – based on the Greek ''dytikos'' (δυτικός), "able to dive" – are the predaceous diving beetles, a Family (biology), family of water beetles. They occur in virtually any freshwater habitat around the world, but a ...

in the family Dytiscidae. It is found in Africa, the Middle East, and the Americas from the southern United States to Peru.Miller, K. B. (2002)
Revision of the genus ''Eretes'' Laporte, 1833 (Coleoptera: Dytiscidae).
''Aquatic Insects'', 24(4), 247–272. This species preys specifically on mosquito larvae in ponds and pools. They can kill up to all the instar larvae of the mosquito depending on size and density of the prey.

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Further reading