Like the other post said, they don't have as much ventral checkering and they also tend to grow larger.

Actually, meahllmorum don't get as big as other western guttata type rats. The biggest of the guttata group in my experience are the slowinski from eastern Texas. I have seen a lot of those over 5 feet and I caught a 6 footer once (73" actually).

This big "slowinski" from east Texas was 5 feet long and meaner than dirt -



The south Texas ones (which would be the true meahllmorum) are lighter colored generally and rarely exceed 4 feet. They are also more slender than East Texas snakes. I don't have a good photo of one (even though they are abundant), but check Gus Renfro's recent post on the field herping forum.
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Chris Harrison
San Antonio, Texas

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• Thorn scrub? - mattkau, Sat Sep 20 20:24:09 2008
• RE: Thorn scrub? - draybar, Sun Sep 21 09:52:55 2008
• RE: Thorn scrub? - DMong, Sun Sep 21 10:30:39 2008
• RE: Thorn scrub? - mattkau, Sun Sep 21 12:01:36 2008
• RE: Thorn scrub? - DMong, Sun Sep 21 14:28:24 2008
• RE: Thorn scrub? - mattkau, Sun Sep 21 19:46:45 2008
• I totally agree! n/p - DMong, Sun Sep 21 22:36:15 2008
• RE: Thorn scrub? - chrish, Mon Sep 22 13:59:46 2008
• RE: Thorn scrub? - mattkau, Mon Sep 22 15:19:26 2008
• RE: Thorn scrub? - draybar, Mon Sep 22 16:39:48 2008
• RE: Thorn scrub? - mattkau, Mon Sep 22 18:43:45 2008
• RE: Thorn scrub? - tbrock, Tue Sep 23 20:08:06 2008
• RE: Thorn scrub? - ratsnakehaven, Tue Sep 23 18:27:27 2008
• RE: Thorn scrub? - mattkau, Tue Sep 23 19:09:33 2008
• RE: Thorn scrub? - tbrock, Tue Sep 23 19:46:43 2008
• RE: Thorn scrub? - mattkau, Tue Sep 23 19:57:57 2008