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Leucospidae (suborder Apocrita, superfamily Chalcidoidea) Family of wasps which are similar to the Chalcidae but larger (8–15 mm long) and which have a somewhat hump-backed appearance. The family is sometimes included in the Chalcidae, but its members hold the wings folded longitudinally at rest through the retention of wing coupling. Adults are brightly coloured black and yellow, and the females have a curved ovipositor which lies anteriad along the dorsal surface of the abdomen. Leucospids are usually found on flowers and are parasitic on various species of wasp and bee.

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