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Photo#331225
Brown Hooded Owlet - Cucullia convexipennis

Brown Hooded Owlet - Cucullia convexipennis
Delaware County, Pennsylvania, USA
October 1, 2008
Two insect(?)eggs are attached this caterpillar. Another contributor posted an image of a fly depositing an egg on the same species of caterpillar:
http://bugguide.net/node/view/331195

Tachinid eggs
These are tachinid eggs, as suggested under the image you linked to. I once tried to raise a brown-hooded owlet caterpillar, and this emerged--I'm not sure if it's the same kind shown ovipositing in the linked images:

 
Thanks for replying
This parasitism (or parasitoidism, if this word exists) is now documented with tidbits from different contributors.

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