just trying to get less confused here.

So what is the difference between a Thamnophis Sirtalis and a Thamnophis Sirtalis-Sirtalis?

Garters with subspecies always have the 2nd name twice? I'd just like to know the difference

Google images don't help because if I search Plains garter sname and eastern garter snake they come up with the same images. Is there some sort of difference I'm not noticing?

I tried googling Thamnophis Marcianus Albino and every 2nd or 3rd result comes up with Thamnophis Marcianus Marcianus

How can you tell the difference between the garters and all their subspecies if there is very little to distinguish between them?