Brown recluse spiders found in the south mid-central part of the US (be sure to use the link to look at the map and photos) can produce necrotizing wounds. Be wary also of the hobo spider and the yellow sac spider. The hobo spider may be found in the Pacific Northwest as far east as Montana and south into Oregon and Utah. The two yellow sac species are found all over the United States.
According to Richard Vetter of the Department of Entomology at the University of California, Riverside, " Ways to reduce bite risk from recluse spiders include:
1) keep beds away from walls; remove bed skirts and items under the bed so that the only pathway to the bed is up the legs.
2) Keep clothing off the floor; if it is on the floor, shake it vigorously before dressing. 3) Store all intermittantly used items such as gardening clothing, baseball mitts or roller skates in spider-proof boxes or bags."
See also: http://www.brown-recluse.com/bitephotos.html
And for info on hobo spiders, see: http://www.hobospider.com/info/#come
"Experts on dangerous spiders in North America agree that pre-baited traps are the most effect means available to control Hobo Spider populations. Bug bombs and pesticides have proven highly ineffective against them and, in fact, are prone to help them because they result in killing their natural predatory spiders, allowing their population to expand unhindered!"
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