Okay, I understand. Sorry about the confusion.
Though I'm not qualified to make a strong statement in this circumstance, I have noticed distinct differences, not only in terms of color or range, between captive M.f.testaceus and M.f.piceus. I have kept both subspecies and it seems there are many distinctions between the two; I have found Westerns to be more heavy bodied and with larger heads than Red coachwhips. Still, I can't say whether or not such distinctions warrant seperate subspecies. As for the other two subspecies of the Western coachwhip (M.f.cingulum and M.f.lineatulus), I cannot offer much - but it is completely possible these are just forms of the Red coachwhip. You have a completely validated point, I just wish I had the concrete evidence to make or break it.
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Roy Blodgett
Green Man Herpetoculture
royreptile@yahoo.com

1.1 Drymarchon corais
2.2 Pseustes sulphureus
1.1 Pseustes poecilonotus poecilonotus
1.1 Lystrophis pulcher
1.1 Lampropeltis getula californiae (desert phase)
1.1 Boiga dendrophila dendrophila
2.3 Pogona vitticeps (snow and red/gold)
1.0 Iguana iguana