Here are some pictures showing the variations in coloration I have found in Butlers garter snakes from the same area.
Bothe of these individuals were caught along the same quarter mile stretch of railroad tracks.



The red snake is Trax- the same snake I posted pictures of when I found her skinny and battered earlier this summer. She has shed several times and bore a litter of seven babies.
The dark colored snake is Scarlet. (Confused yet?) She was caught after having her babies, and has not shed for me yet.

Facial coloration. Scarlet upper, Trax lower.


Dorsal coloration.


Belly contrast. Trax's coloration is unusually red for Butlers found in this area. Scarlets greenish belly and dark dorsal coloration is more typical of snakes I've found. 'Sang' the mother of the other litter I posted pictures of is of the more common coloration.