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#wasp

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A host-specific wasp laying eggs inside a caterpillar is:

A wasp whose offspring develop inside one caterpillar and ultimately kill it is a parasitoid. The female selects a host and deposits eggs; larvae then consume host resources while often manipulating or suppressing host immunity. Death is usually delayed until larval development is complete, distinguishing parasitoidism from rapid predation and from ordinary parasitism, in which host death is not an inevitable requirement. Host specificity can reflect precise adaptations to host physiology, defenses, and life history. Mutualism and commensalism would not cause the caterpillar's eventual death.

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 8-13