Possibly Desert Striped
The Audubon guide (pg. 631) notes that the Striped Whipsnakes (M. taeniatus ssp.) can be reddish brown (check), with 2 light lines on each side (check) and large head scales edged in white (check). Desert Striped (M. t. taeniatus) is dark brown and has white side stripe divided by a black line (check).
(BTW: check = photo shows characterisitc)
Hope this helps.
John D
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