[ETL]

Is this it?

Texas Night Snake
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Or this?

Western Cottonmouth

http://en.wikipedia.org/wiki/List_of_Texas_reptiles#Snakes
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The next is your photo:

[humblegunner]

Yep, I’m thinking cottonmouth.

[calex59]

Apparently you didn’t look at all his photos. Neither snake you show in your photos is a pit viper, the snake in his photos is definitely a pit viper. Probably a moccasin.

[Caipirabob]

Thanks for post #64, ETL.

Obviously too close to looking like a cottonmouth to take a chance.