Found this:
http://www.ext.colostate.edu/pubs/insect/05512.html
Funnel weaver spiders are harmless but are often mistaken for the brown recluse, a potentially poisonous species that does not naturally occur in Colorado. Funnel weaver spiders differ from the brown recluse in that they have a darker brown color with black markings on the abdomen, lack the characteristic violin marking on the cephalothorax, have four pairs of eyes instead of three, have striped legs, and are considerably faster.
Thanks to our highly mobile society lots of critters, especially small ones like bugs, have expanded their ranges considerably.
I agree with you about Black Widows, they don't worry me much because they are so shy. I spent a couple of weeks at a friend's house in NM and had to sleep in an unfinished room. There was a big Black Widow living under the drywall about six feet from where I slept on the floor. There was no baseboard so it was open at the bottom. When I would come into the room it would run up under the drywall. After a while it would come back out to sit in its web. I had no fear that it would bother me. The last thing it would ever do is venture away from its web.