These species all end up with no pattern or striping, making them a solid color.  This can be their normal design or it can be a pattern that becomes obscured by age, which happens with several species. Click on the image to learn more about each one.
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                 Coachwhip                      Diamond-backed watersnake              Flat-headed snake                  Graham's crayfish snake
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        Northern cottonmouth            Northern rough greensnake             Northern watersnake               Plain-bellied watersnake
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    Plains black-headed snake                           Racer                                    Ring-necked snake                   Rough earthsnake
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       Variable groundsnake                     Western mudsnake                       Western ratsnake                 Western smooth earthsnake
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        Western wormsnake