*vc geek alert*
Identifying native species will be tricky. (Truth is there are only a few scientists that can- but some species actually need to have their DNA run to properly categorize!)
This site is helpful to narrow down what you may have wrangled..earthworm ID
The glaciers did do a number on the regions they covered.. in particular the Great Lakes area, a bit across the upper Midwest, and the NE. (If you want to get really geeky about this.. the US actually has a very interesting worm.. the Palouse earthworm. Very large- 3 feet long, snow white.. and when disturbed- smells like lilacs. They thought it might have died out.. but someone found one in Idaho.. which for those scientists.. was probably like discovering a unicorn.) It's only relatively recently that any real interest is shown to that species.
Miles is right about there being different types. At maturity- earthworm get that band around their body (clitellum).. which rolls off them to become the cocoon. The "fresh" rolled off ones are white and get darker with age. If they recently deposited a cocoon.. there will be a depression where it was. It's the mature size that you want to use to gauge what type it probably is.
A really generalized run down...
anecic- typically large earthworms- they create rather deep burrows- they generally need cooler temps- they like deeper soils and some space in an area that isn't disturbed too much.
Endogeic- mid-ish level dwellers- rough ballpark about 4 to 6 inches.. kinda mid sized. They're the ones that hang out a couple of inches into the soil. In some parts these are the ones we find when we turn the soil in gardens-hanging out in raised beds and wandering through the lawn under the sod.
Epigeic- smaller- typically pigmented- they are the upper level dwellers. This particular type does well in bins.
... And just now I notice the last post was in April. *sigh*
I've had vc bins going for a decade now. It's fantastic stuff for mitigating transplant shock and sprouting things. (I'm always amazed at what nubs of things come back to life in there..) Mine are all rounded up from the yard. It's a lovely consideration that you want to use natives. There's no real way to stop the invasives- which is unfortunate.