I thought that I had an annulata before, but I have a new theory. I think that my snake is a sinaloae/abnorma hybrid, and not necessarily half & half:

Sinaloan traits
Red bands are wide, 2-3 times as wide as black & pale bands
thin pale & black bands, pale bands are usually only two scales wide
upper snout is mostly black, with no chevron
very calm, active & inquisitive

Guatemalan traits
darker, blood red bands
smallest pale bands at each end are tangerine, most others are golden tan
underside of chin has lines & blotches

I finally found a link that gave a strong clue. It is from a prior Herp forum post by Doug Mong:
http://s212.photobucket.com/user/DMong_bucket/media/blanketyblank_zpse654c9a6.jpg.html

It also turns out that that Doug’s Guatemalan was from Lago de Izabal, an area very near the Yucatan peninsula, where the Blanchard’s snakes have such golden bands.

Here are other examples of Guatemalans, which typically have thinner pale bands than Pueblan specimens, and often display a golden or tangerine pale band, especially near the head & tail. Black bands are often two times wider than pale bands:
http://www.pitt.edu/~mcs2/herp/herp.pics/Lt_abnorma.jpg
http://milksnakes.org/encyclopedia/abnorma.htm

What do you think? What species or cross is your guess?

1.0 Lampropeltis triangulum sinaloae/abnorma?
1.0 Pantherophis guttatus (Tallahassee area colors & patterns)
1.0 Agrionemys horsfieldii kazakhstanica
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