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pdf file of publication "Crab Spiders of California" by Robert X. Schick. Bulletin of the American Museum of Natural History, 1965.

I just found this gem in the references from Ubick, et al. and it appears to cover both the modern families Thomisidae and Philodromidae. It should be great for California and may also be useful for other Western states...
http://digitallibrary.amnh.org/dspace/bitstream/2246/1114/1/B129a01.pdf