Most familiar wasps belong to the Aculeata, a division of the Apocrita whose ovipositors are modified into a venomous stinger that includes ants and bees. In this sense, the species called "velvet ants" (Mutillidae) are actually wasps.
A narrower meaning of the term wasp (http://www.fly-kill.co.uk/pages/wasps.htm) is any member of the Aculeate family Vespidae. This includes the yellowjackets (Vespula, Dolichovespula spp.) and hornets (Vespa spp.).
Wasps are critically important in natural biocontrol. Almost every pest insect species has a wasp species that is predator or parasite upon it. Wasps are also increasingly used in agricultural pest control.
USS Wasp, a 14,700 ton aircraft carrier, was built at Quincy, Massachusetts.
Wasp was dispatched to the Pacific in June 1942 to reinforce U.S. Naval forces there in the wake of the carrier battles of Coral Sea and Midway and in preparation for offensive operations in the Southern Pacific.
On 15 September 1942, while steaming well to the southward of Guadalcanal, USS Wasp was torpedoed by the Japanese submarine I-19.
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