It has been several years since I've looked at these pictures and I'm not sure where the original specimen has gotten off to, sadly (after several moves and life changes, things have become heavily disorganized here as I await yet another move once someone accepts one of my applications for work.) However, after some online searching, I believe this specimen is of a Hoplopleura louse.
If you look up images of Hoplopleura online, most of them are of H. acanthopus which I'm not sure is found on Sciurus carolinensis. Even so I believe my photos depict an insect similar enough that we can say it's probably a member of the genus Hoplopleura. With that said, I'd like to point out that H. sciuricola does have a record of living on S. carolinensis, so while I don't know if these photos are good enough to get this specimen to a species level of identification, I do believe that H. sciuricola is the most likely possibility.

Moved to the new Anoplura, within Psocodea.

What a cutie.

Could you get some shots against a black background? It may help in bringing out the edges. Perhaps if you have a microscope base that has a flipping stage circle (one side white, one side black). I did these in alcohol with an automontage system using fiber optic light sources, but you may be able to get similar results with your setup and a black background.