I would say you were on the west coast because I don't think you find Trimorphodon near Tampico, particularly down in the lowlands there.

So from top to bottom

Crotalus atrox
Trimorphodon biscutatus
Boa constrictor
Leptodeira sp. or Pseudoficimia sp. (need a larger photo)
Crotalus atrox

However, I don't recall if atrox actually gets over there on the west coast of Sinaloa, which makes me wonder. The crotes aren't C. basiliscus but they might be C. scutulatus? I'd have to check range maps for big mexican Crotalus.
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Chris Harrison
San Antonio, Texas

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• dead on the roads of Mexico - jimfmcdonald, Sat Apr 19 01:44:04 2008
• RE: dead on the roads of Mexico - Greg Longhurst, Sat Apr 19 04:19:55 2008
• RE: dead on the roads of Mexico - chrish, Sat Apr 19 11:26:39 2008
• RE: dead on the roads of Mexico - DMong, Sat Apr 19 11:54:39 2008
• RE: dead on the roads of Mexico - Greg Longhurst, Sat Apr 19 19:36:55 2008
• RE: dead on the roads of Mexico - DMong, Sun Apr 20 11:01:30 2008