[GarterGuy]

Ok, with just a top view it's really hard to tell if it's a T.radix or not. A side shot would work a lot better. The differance between the common (T.sirtalis) and Plains (T.radix) is that the side stripe is on the 3rd and 4th scale row (2nd and 3rd on sirtalis) and also they have a row of black spots between the side stripe and the belly. As far as it being gravid....doesn't really look like it.....kind of lean looking for a gravid snake. Hope this helps.
Roy