cathyjc, you sure it was a "Camel Spider"?
Of the types of Camel Spiders I know of, they don't "rattle". They either hide in the sand and 'ambush' prey as it passes close, or burrow through sand looking for it.
Some Skorpions, do "rattle" and are quite large, not all have the distintive 'tail' some can have a small tail. Unless disturbed most won't sting.
IIRC. The Tourags talked about a creature they called a "Sand Spider", it wasn't a Camel Spider, but sort of a cross between one and a skorpion with out a tail.
It came out at night, hunted on the surface and was very aggressive, 'rattled' as a warning but prone to strike also.
Never saw one so can't say it is true.