The pictures above are solpugid's if you count they have 10 legs and are more closly related to scorpians then spiders. We have those around as well though not in that size. The site below has good info on them.

My one poisonous desert dwellers book has them in as a sub catoagory as the ugliest creature that should be poisonous but isn't!

http://www.solpugid.com/Introduction.htm