Answer: Cool! I've always wished to witness this aspect of the food web! I've seen many photos of hornworms with the eggs of braconid wasps attached, but never the real thing. It's pretty gruesome when you think about it, but fascinating, too. The native wasps lay eggs on the caterpillars, and the hatchlings burrow within the pest to feed. If and when you see this phenomenon again, leave the caterpillar where it is, and the wasp larvae will take care of it for you. The fallen eggs will not survive without their host.
I congratulate you on making your garden a haven for a broad range of insects - they repay you many times over!
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