Utah State University Extension
This key is intended as an identification aid for spider specimens commonly collected from indoor situations in Utah. It is not all-inclusive and will not correctly identify all spiders. However, the key does include groups that comprise about 90% of the specimens that are submitted from household situations in Utah, and about 80% of spiders submitted from all situations.
Roe, Alan H., "Key to Common Indoor Spiders Found in Utah" (2005). All Current Publications. Paper 1339.