I too have been approached by more than 1 Camel Spider in my time in the Middle East, and basically mimick what Adler has been saying... They are also called wind/sun scorpions...
Ive had one jump on me before, as well as chase me... And like everyone who knows anything has been saying, it was attempting to get in my shadow, not eat me...
They arent spiders either... Entomologists call it a solifugid, part of the Order Solifugae , but they do belong to the class Arachnida... Spiders are in the Order Araneae... Solifugae also have long pedipalps, which function as sense organs similar to insects' antennae, and give the appearance of the two extra legs up front... The most distinctive feature of Solifugae is their large chelicerae, or 'fangs'... Each of the two chelicerae are composed of two articles forming a powerful pincer; each article bears a variable number of teeth or spines as well.....
Kingdom: Animalia
Phylum: Arthropoda
Class: Arachnida
Order: Solifugae
Heres a vid clip of one eating a lizard....