I have trouble distinguishing between all of the tropical/neotropical rattlers. Anyone want to tell me which one this is?

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I have trouble distinguishing between all of the tropical/neotropical rattlers. Anyone want to tell me which one this is?

I would name him Stanley...LOL!
sorry, couldn't resist...you said name, not identify
ok.. that was funny, I don't care who ya are, that's funny right there! 
On the other list, two people said they were pretty sure it was a C.simus.. so will go with that.
Stanley is a great name...LOL!

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