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Photo#913036
unknown parasitic wasp larvae feeding on caterpillar

unknown parasitic wasp larvae feeding on caterpillar
roadside ditch 2 miles north of Auburn, IA, Sac County, Iowa, USA
September 21, 2013
many larvae feeding on caterpillar and apparently spinning a protective cocoon at the same time. The second photo is of a nearby cocoon from which adults have emerged.

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unknown parasitic wasp larvae feeding on caterpillar unknown parasitic wasp larvae feeding on caterpillar

Moved
Moved from ID Request.
These are microgastrine braconid wasp larvae. They did all their feeding while living inside the caterpillar, and your photo shows them exiting and spinning their cocoons.

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