My educated guess:

A Thayeri X Ruthveni hybrid.......It does not have the typical thayeri bands normally seen on MSP thayeri....It has the Ruthveni look to it, but not pure ruthveni.......Ruthveni have normally black heads with mottled noses....red and white spots......

Mexicana is a taxonomic mess to say the least....there are many intergrades in Mexico found in overlapping ranges......
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John Lassiter
Poor planning and procrastination on your part does not constitute an emergency on my part...