Mutated , actually is exactly the word I did use.
They seem to be a cross-breed of some sort and regardless of what eventually you (figurative) might read, plastic coverings???
One word..."Ha (o.k. 2 words) ha-ha:)
They can go through just about anything because they're that small. So, should you encounter something of these sorts, it's been my experience, NOT to waste a lot of money on cedar chips, garbage bags, bug foggers, etc.
We've got them under control to an extent as long as people don't bring their pets in and out. It might be ok with a thick layer of snow, but not now w/the leaves falling.
Borax works and a few other things, but I get the feeling there's research being done...like people taking notes when you go to the DR. and seeing, just exactly what these things can do.
At some point, it feels, some how some way, they'll be clasified, it feels, in this health care REVAMP...
For right now, it seems "Scabbies" and "Ticks" "Lyme Disease" are acceptable...and I also find steroids being one of the prescribed medicines.
My own parents have had a bout w/something similar and they're jokingly calling them, "No see-um's"