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I consulted H.-P. Tschorsnig (Stuttgart), he is the real expert in Tachinidae.

The chances of C. rasa being bred from Acronicta are in his opinion very small indeed, because Acronicta has been bred many many times and C. rasa never occurred (C. atricosta did once).

There is a small chance that the species might be Senometopia separata.
On the other hand, given the new info by Black, there is the possibility that a Lymantriid was the host after all !

My personal view is that the second option is the most likely.
if th specimen was collected, and/of if we can get a photo of the middle leg in frontal view or back view, we can get to a really positive ID.
I know, you make such great pictures, and then I start complaining about not being able to see the underside of the middel tibia!

Theo Zeegers