From what i can see and what you described these APPEAR to be a type of mite that infects insect colonies like mealworms and crickets. They are really really tiny right.....almost hard to see?!? They aren't lice at all but a mite.
They feed on the shed skin of these insects. I KNOW this because i had a severe infestation of them and i did enough research to find out what they were and how to get rid of them.
I got them with some crickets i picked up at a petstore. I'll never buy feeder insects from them again! It took a long time to really get rid of the mites.....they had spread from the cricket container to the unit it was on, then to the wall.....from there they went EVERYWHERE! I ended up overwelming the house with the smell of bleach and raid. I washed all the walls, carpets everything.
There are strings in the forums about them as well as alot of info online. They are not supposed to be harmful to the lizards but i didn't take any chances.
Red 
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Crested Gecko Zeek:1.0
LEOS: Boo: 1.0 normal , Bronx & Nala: 1.1 blizzard,
Lily: 0.1 patternless, Abby: 0.1 albino, Zoe: 0.1 reduced pattern, Dot: 0.1 hypo
Chip: 1.0 papillion (small dog)