---

On 12. iii this year I collected a larva I found under loose bark on a spruce log on the forest floor. The forest near Copenhagen is predominantly deciduous. I took the larva home to rear it.
Six days later I checked on it and at that time the larva had hidden in a slimy tube covered with earth and debris. On 9. iv I checked again and something had gone terribly wrong. The larva had been about to hatch but had died in the attempt.
Now the question is whether it can be determined further?
It appears the wings would have become mottled, perhaps with a ring-like pattern.

What are the gnarled disc-shaped protuberances on either side of the head?

Regards,